You can try slow down your first layer. With PLA, I usually recommend 210-215 on first layer and 200-210 on subsequent layers. I find it adheres better with a hotter temperature on the first layer. The humidity or heat of the room can cause problems with adhesion, but layer shift problems are usually to do with the mechanics of the printer. It maybe the belt slipping or drop in temperature causes the configuration of the printer bed to move.