Hi everyone, Looking at Task Manager revealed that it might be the Dell Support processes - the Dell Data Manager process was running whenever the locking occurred. Dell supplied instructions for removing the Support Assist and associated applications, and since removing this software the laptop has not frozen at all. Therefore this appears to have solved the problem for me. Thanks to the Dell support engineers who looked into this - please can one of you post the instructions here for removing the Dell tools to see if it works for others? Thanks, Neil.
I've recently bought this Dell Inspiron 15 3515 with AMD Ryzen 7. A few days ago, I was using the computer for my regular tasks and suddenly the fan goes wild making a lot of noise and the screen freezes for a few seconds. This happens twice in 3 hours of use. I've also realized that this doesn't happen when the computer is plugged.  I already have the lastest BIOS, Windows, drivers, etc. And I don't think it is an overheating issue.  Please help.
Dell inspiron 15 3515 random loud fan noise and freezes