Help detecting a fault


My router restarts/disconnects randomly within a period when one of my clients is here. I have confirmed that my firmware is up to date. Below is a link to a sample of the logs of a specific time before and after the device restarts/disconnects. I was hoping if anyone can figure out what's goin on from the logs?

Sample of data (The part at the top is the security log pull of the restart in question)

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The device in question is: 

Samsung Galaxy S21 MAC: 12-6B-D9-48-52-92

IF at all possible I'd like to fix this but if not I'll get a new device again. (I've had this one for 3 months)

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