I see others with a similar problem. On my Windows 10 Pro machine; IE 11 "stops working", tried the suggestions (software rendering, Disable Protected Mode), neither worked. Removing Protected Mode is a terrible hack and should not be used by any legit software vendor. I can run on all browsers on my Win 10 Home laptop. Very frustrating. Removed all Sling software and re-installed to no better results. I don't know if Sling desktop still works for M1 (I have two M1's) but when I installed it, it prompted me for a sling device password - there is no such thing on my M1s.
I also run fine with all my small devices - iphone, ipad, etc.
Very very annoying!