I got the (loose sheet, box of 25) film last year, kept it in the refigerator whole time. 1 day before shooting i took it out and let it warm up for 24h. Shot it in my studio. After that i did the same with ilford fp4+, no problems there... there are even in the middle things visible that should not be there. i shot 3 negs and they all three have these things (looks different) Anybody an idea what could be the problem?