Internet dropping every 20-30 seconds - ethernet, wired and wireless! Help!

But would that even help if I've already tried two different routers?

I did do a tracert. Don't have the screenshot now, but I can post it later today.

Here are the results of some tracerts: https://goo.gl/photos/zxgwJHQJtJR5rUEq7

Will try to bypass the router now, not sure how to do it but I think I can figure it out. Do the tracert results help at all? I thought it may have been the fifth hop but I am not sure. EDIT: Sorry but I still don't see the point of this step if it's happening both on ethernet and wifi, on two different PCs and on two different routers. Could you please help me understand the point of bypassing the router?

Only 8.8.8.8 drops, pinging to the router is fine (original post says no timeouts occur when pinging the router).

Thanks Joe, I appreciate it.

Does the fact that the packet drops on the fifth hop in four out of six tracert attempts mean anything? Could the problem be in the fifth hop? Which, if it is, I really have no idea how to troubleshoot that.

By the way, I don't think plugging into the modem directly applies in my case as I believe my router serves as the modem and router combined. I see no place in the back of my PC to plug in any phone line. Of course, please correct me if I'm wrong. I'm an amateur in all this.

Thanks Joe, at least I know I've tried well! I'm considering redoing the wiring of our flat's main phone line and the phone jack just to double check that everything is okay from my end. What's strange is that the drop is very regular, not sure if that sheds more light.

I was pleasantly surprised to have a Vodafone employee call me to tell me that they tried to do something else to fix it. Didn't quite understand what it was. Either way, it didn't work and the problem persists.

I'm considering switching ISPs but I'm worried it's an infrastructure issue and the problem continues even with a different company. If you have any thoughts on that, I'd appreciate it.

So a small update but I'm still nowhere near a viable solution and it has been over a month now of connectivity problems:

New observations that may be relevant:
- Our phone line went dead on two (maybe three?) different occasions in the last couple of weeks; this to me meant it could be a faulty line that may be impacting the Internet
- On one occasion, telecom called us back saying it has been fixed. As far as I know nobody came to the house to fix it but it may have been some maintenance around the area or at the phone exchange, not sure. During another occasion, the techie came over and fiddled with this box near the wall where the line comes out of. I am not quite sure what this box is, it looks like a splitter, only put against the wall and out of it comes the main phone line of the house. That's the best description I could say. He said something was wrong with it, and he fixed it. Brought a separate techie to ask him to rewire just to be extra sure, and he assured me there is no reason to do so and he refused to even do it because there is no need.
- ISP claims that Telecom is overloading the fibre optics cabinets with more than they can handle and this is impacting our service
- Researched and found new ethernet drivers and manually installed them, same thing
- Fiddled around with DSL modulation on router's setting as I became aware that different modes impact stability and nothing

Temporary alternative:
I discovered Speedify, a programme which mitigates packet loss and stops it from impacting your service by keeping a secondary internet connection as a backup to send packets through when the loss happens. This has really improved our situation but we still get serious lag and it is by no means a durable solution. Our ISP was kind enough to provide us with a mifi so that is our secondary connection but once its quota finishes, that will be more money down the drain and I imagine we will need to subscribe twice to Speedify to be able to have two PCs running with minimal packet loss. Just putting that out there for anyone that may find it useful until their solutions are fixed.

Other updates/actions taken:
- I have now escalated my issue with a governmental authority/watchdog which should hold the ISP and telecom accountable and take constructive action. Looking over this entity's statistics, I see that they usually get an 80-100% consumer satisfaction upon following through with telecommunications complaints. In terms of my ISP, they generally have a 100% feedback from customers, so I am hoping they are able to take constructive action soon this week.

- As distance to the telephone exchange impacts reliability of this type of fibre optics (i.e. FTTC), there is some indication from my ISP that the telecom company is not using the appropriate cables for this distance. According to Google Maps our distance to the phone exchange is 561 metres. I will try to push to fix that either by connecting us to a different cabinet or requesting proper infrastructure, somehow!

- I will also be asking my neighbours to test their connections and informing them how they can test their connections to see if they are getting a reliable connection. My relative, in another neighbourhood, is using the same ISP and has zero packet loss. We pay the same amount of money but my service is severely compromised, while theirs is flawless.

- If all else fails, I will have to initiate a full-on social media war on the ISP and telecom, including preparing information pages for users in this city to test their connections. So many people are not aware and are just thinking, "Oh man, Skype is just bad today." I will not stand for it!