I have raised this issue before on unrelated posts. I have been experiencing this issue randomly since the release of 5.8 or 5.9 (hard to recall when it started exactly.) Earlier today I opened the program, created a new site, dragged the Lightbox Gallery component on to the page. I took a couple of screenshots to post in an unrelated answer here in the form, and then I quit the program. It was open for a grand total of about two minutes.
Normally there are 4-5 Bootstrap Studio.exe processes running whenever the program is running. Shortly after closed the program, I noted my CPU temps were running hotter than normal. When I opened Windows Task Manager, there was a single instance of Bootstrap Studio.exe still running. As soon as I ended the process, my temps dropped.
Despite many hours trying, I cannot find any pattern or trigger that causes it. It seems totally random.