tried DIY on drifting stick and its all gone downhill from there

Ok so i had a scuff one controller with drift in the stick. I ordered a new analoge module or whatever its called and soldered it in. The controller worked great for about 15 mins then cut off and would cut back on. Then i decided to take the back off that controller that had the scuff buttons and solder it to a stock controller. Tested it out before i put it back together and it worked great, so i soldered the rumbles back to the board and finished assembling it and when i got it back together the B button wouldnt work on the front or the back of the controller. I took it back apart and desoldered and resoldered everything but still no luck. Do you have any ideas?