LO keeps crashing

On Windows 10 and LO 5.3.7: Using Firefox, and Chrome, and Thunderbird for emails. I save an email as an HTML file. I open it add new data, and when I hit save, LO crashes. It says trying to recover my file - but doesn’t always succeed. Last time it locked computer, and when unlocked desktop icon would not launch LO, so I downloaded a new copy of LO. It is still crashing under same circumstances! What am I doing wrong? Since I wrote the above yesterday, have been using Libre Office, but ir now crashes every 5 minutes, without me doing anythinG!

First we reset the user profile and we wait for somebody more experienced and smart…