My old computer (5+ years) now shuts down without any warning every 5 to 20 minutes. There may be a fix for this, but I have decided to bite the bullet and get a whole new system. The old system is off to purdah in my school office as soon as the new one can do all the work the old one used to do.
Setting this up is not a simple job, however. The new computer is Windows 10, and there are multiple issues installing the software I was using on the old system and updating to the latest versions. Have not yet reached my 19th nervous breakdown, but give it a week. Uh-oh, here it comes!