My iPhone keeps signing out of iMessage frequently.
Fairly recently, my iPhone started signing out of iMessage frequently, once a week, at the very least. I have been able to sign back into iMessage multiple times, but it takes so long to sign back in, and if I am to have the hopes of signing in successfully, I'd have to turn off iMessage, turn it back on, and stay on the Settings > Messages screen until iMessage is finally working again. I will also note that I have also tried selecting "Use your Apple ID for iMessage", but it availed me nothing. I would like to know what is causing this problem and how I can fix it. Thank you for your help!
iPhone SE, iOS 13