I found this post on the ZWO forum ( I’m a member )
Don’t know if it helps but probably worth a read
https://bbs.astronomy-imaging-camera...ro-flats-issue
Chen (w7ay ) is a very knowledgeable astrophotographer and has helped me out on a number of occasions with my 2600 camera
Historically the 294 has been a good but temperamental camera
Cheers
Martin