Have you updated your bios?
Crashing on Systems with AMD Ryzen CPUs
We have seen reports of Overwatch crashing on computers with AMD Ryzen CPUs due to a bug with older BIOS versions on certain motherboards. To prevent this crashing on your Ryzen systems, please update the BIOS to the latest version using the files and procedures found on the motherboard manufacture’s website.
Once this is done, you should also update the chipset drivers for the card .
The BIOS and chipset drivers are the links between the hardware and th…
You might still be on too current of a driver, according to the pinned thread from the staff:https://us.forums.blizzard.com/en/overwatch/t/known-technical-support-issues-updated-april-12-2020/25/25
You can also check the Windows Reliability History tool to see if you can spot whatever is causing the timeout event. Sometimes it can be overclocking, as Overwatch isn’t friendly with XMP or GPU overclocks (even stock OCs).