Thunderbird crashes with a single keystroke

I am a huge Tbird fan, using it forever, donating to it, recommending it to others BUT... GEEZ, ever since this new total rebuild, it's become so inconsistent and unstable as to be almost unusable. In fact, now I can't use it at all because a single keystroke causes it to crash. Even the crash reporter crashes! I am on the latest version 115.7.0 I have gone into troubleshooting mode, disabling all add-ons Nothing helps. The problems began with the mouse double-clicking with a single click. Fixed that with removing and reinstalling mouse device driver. Now, as mentioned, when I reply, place a cursor and type a single keystroke, Tbird crashes. As mentioned it pops up a crash reporter. I can't type in that...as soon as I try, it crashes! (Yes, the crash reporter crashes!) Sadly, I am really dependent on Thunderbird. Is there anyway I can go back to a stable version before this giant rebuild was created. Seems the problems all began then. thanks for any help, advice, Pradhan