"Yahoo has stopped working" message

I have Yahoo email on my Galaxy S4, and have the latest version (auto updates enabled).  I routinely delete old spam and trash emails on my COMPUTER, thinking that they would also delete on my phone, since the rest of the folders and emails seem to be mirrored from computer to phone.  My phone has recently said it is running out of memory (16GB with a 32GB micro card recently added).  I went into my phone Yahoo emails a couple of days ago to delete some from my inbox, then deleted spam, and then when I went to the trash folder it said that it contains over 7,000 old trash emails!!!    How can that be, when I have deleted from my computer routinely?  I also routinely empty the cache on my phone apps.  I first looked at the Yahoo email on my computer and I see that it apparently auto deletes from trash, because it only contains a couple of months worth of emails.  So, I couldn't delete more from the computer version. So, I started trying from my phone to delete emails from trash, a few at a time.  It would delete four or five, and then it would freeze and say "Yahoo has stopped working" and dump me back to my startup screen, where I have to go back into Yahoo email and delete a few more and get dumped out and so on and so on.  This is very very annoying.  Any ideas what I should do now?   I'm about to go to the AT&T store, maybe tomorrow, to see what they can do to help me.  I had no earthly idea that my phone would retain over 7,000 trash emails when I have deleted almost all from my computer email.  Very strange! to say the least.

Oh, one more thing I will mention is that I recently did a Yahoo recovery request - about 4-5 days ago, in order to try to recover one email from 7/1/2019 that I accidentally deleted.  So far, that email has not showed up.  Now I don't need it, but I also haven't noticed any additional "old" emails returning to my account, so I don't know if the Yahoo recovery has had anything to do with my problem.  Worth mentioning.  Maybe that was my problem.