I have the exact same problem ! I'm using GX and 67 in the meantime but I tried lots of solutions and none are working I have no idea where the problem is coming from.
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RE: Opera crashes ~1 minute after being openedOpera for Windows
RE: Opera crashing constantly since windows 10 2004 updateOpera for Windows
I have the exact same issue here. I'm using GX in the meantime but Opera 68 keeps crashing every single minute, sometimes reopening itself. It worked fine yesterday, I turned down my computer by downloading the last Windows update and woke up installing it earlier this morning.