"Rendering Device Lost" Crash

Lately, after the latest patch, I’ve been getting “Rendering Device Lost” crashes semi-randomly. Strangely, they’re only happening during competitive, but that may just be because that’s where I play most often.
Each time, the game suddenly freezes and I get a pop-up about saying “Rendering Device Lost! Application closing.” I can still hear voicechat and the sounds of the game, but I can’t do anything but force-quit Overwatch. Haven’t found any reliable fix, and it’s already gotten me suspended from competitive twice.
Please help!

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This troubleshooting in the technical support forum may help: