It seems a lot of folks are having issues this season. This problem has been around since PTR and Blizzard has acknowledged the issue, and even asked folks to send debug files. At one point (I think Aug 2020) they requested folks to STOP sending data.
All the post I have read provided peculation and possible fixes. I can attest that I have followed EVERY suggestion with no actual fix. Even though I have a 64 bit machine, I tried running the game platform on 32 bit; negative results.
I am a WW barb and have experienced freezes in solo GRs, as well as, group GRs. The 4-man group I run with, we do 115+ and as Zbarb experience 5 or more freezes per GR.
The FB Wiz in the group is running Windows 7 and HAS had freezes, but on a MUCH lower scale then the rest of the group running Windows 10 (v2004) on overkill machines.
All my freezes have occurred (even solo play) on GRs above 110+. I can run rifts and bounties all day without experiencing one freeze, but doing high GRs, the freezes are constant.
I agree with most posters, that Blizzard support has not responded to this issue in quite some time (the last post I saw from Blizzard was Aug 2020). With all the talent Blizzard employs, it is hard to believe that not one dev has any clue to this problem, or if they do, why there has been no posted update to how they are progressing on the issue.
In my humble opinion, D3 hasnt been a money maker since the last DLC and is now probably minimally staffed while the dev force is on D4. This issue has probably been labeled, “We’ll get to it when we have time”!!!