Steam Deck feels laggy/slower

Steam deck feels laggy/slower

Hello everyone! Today i swapped my 512gb default ssd to 2tb one. After installing steamOS the whole menu feels kinda laggy. Like, when i press the three dots, the side menu appears with a lag. Same issue with Firefox browser in desktop mode. Even games feel strange. Before my persona 3 reload had stable 60 fps, now with the same settings i have constant fps drops up to 45 fps and it is hard to maintain even 55 fps at 12w. Maybe the problem is the lack of system/game cache and/or the auto update to the newest stable version, as i never updated the version since i bought the Steam Deck. Wonder if anyone had the same problem and maybe can help me. I would appreciate any help!