Please help, not sure where to post as i have yet to have many trouble with the game

When ever i am fighting a mage or a lich that casts time stop spell the game crushes a second or two after. happens every time. obviously it makes the game almost unplayable as there are many many enemies who use time stop spell.
so i have started a new game with the big world setup of the hardest mods option installed. i might have switched around a few options to my liking but nothing big.
would appriciate help. so far (i am in spellhold) i have been able to cheese win those fights by casting acid fog and letting it kill the mages and or liches by waiting out their defences. but it becomes increasingly difficult to do so.
also i have trouble saving the game as i constantly have the messege that enemies are nearby, started after the shade lord village. the message appears every time i load a game. i can save normaly once i change a zone(but not go into a house, need to change zones like in amn map from temple districs to slams or something of the sort) and sometimes after i change zones orc archers appear(sometimes one or more depending on how many times i loaded before changing zones) i assume those are the enemies that prevent my saves and rests. but they dont appear after simply loading the game, only after changing maps and not always would they appear.