Interesting...
I also use Phone Link and I used mobile hostpot at some point but I have it off at the moment (have not used it/turned on since I re-installed windows and kept my files), but still this might be worth looking at. This sounds psychic, but after I wrote my first reply to this post (a few hours earlier today), I ran "check for updates" in the settings section, and there happens to be a new cumulative update released today. I installed it and the issue seems to have gone away... I have woken up my laptop from sleep multiple times and none of my MS apps have closed after waking up. I don't know if I'm being too hopeful or if the issue has really been fixed. Hopefully I don't jinx it haha. I'll leave a screenshot of my update history if anyone wants to give this a try.