2-3 seconds action lags at late game

At late game if i try return to battle from options, or try change solder, or try use same skills, game freezed for 2-3 seconds.
If i try ise Electric Reinforcement, its instant work, and then i have 2-3 seconds lag.
At new game all ok.
ryzen 3600, gtx1080, 16gb memory, ssd.
Its bug or my problem? what can i do?
I fix problem. I sell my junc (warehouse 600 to 280). And now lags only about 0.5 sec.