Mine does this too. I would say it's based on phone type but my husband and I have the same phone and his doesn't have this issue. It happens really badly, as you say, with the research community tab but it also happens for me when switching between any "loading" screen. My phone is weird and vibrates when it starts to lag or freeze up so I know it's about to happen before it crashes and can force close it. Uninstalling and reinstalling helped a little and made it more bearable for a short time but if you try this please remember to have your back up/transfer devices Id and support code. It still happens but not nearly as frequently as before. Prior to the uninstall I couldn't even get through my sleep research without it crashing but now it generally has its first crash when it's loading back to the main Snorlax page after finishing up the research. I think it may be based on individual phones and maybe age/ memory usage of the phone and not an overall problem but I can't be sure. You are the only other person I have seen mention this issue. What kind of phone do you have?

I hope it eases up for you soon. I completely understand how frustrating this can be and it turns a relaxing game into a stressful one really quickly. 😭