Gx 750w continuous shutting down

[tanoos]

hi I have cooler master Gx 750w psu, was working fine but from last week its continuously shutting down pc getting restart after first use of 20 15 mins it restarts after every few seconds, keeps on restarting after 4 sec or 5 or 10 sec.....if I leave it for 30mins off then starts nomally and then again after few keeps on restarting......changed the fan changed 400v 560uf capacitor it worked for few months and now again same issue now again I changed capacitor but now it not working restarting again and again please help.....

 

[tanoos]

Temp are normal n cool.......