That is always a good thing to try. You want to use 1,6 or 11 and set the channel width to only 20mhz. It may limit your top speed but it will reduce you change of contention. 40mhz uses 2 or the 3 blocks so your chance of contention with another person is high.
If you have a dual band router try to use the 5g band. It may or may not work better, it has less coverage in your house but it also gets less from neighbors since it must pass though the exterior walls. There are many more channels to try on 5g.