I deactivated Frostfall + skyUI 2.2 and continued to play with the same save. Haven't got this issue for ~3 hours. Enabled skyUI and got it again in 20 min... Gonna try QD Inventory SSE instead to see if there is any difference. After you try that tell us if it happened again please. I never had Frostfall, but yesterday uninstalled skyUI and installed QD Iventory right away, and it keeps happening. Ok, I was wrong, It still happens with and without interface inventory mods...