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I have noticed this problem in 2 separate locations. In both cases they are computer monitors connected to a surge protector extension cord.

Every time the lights or fans are switched on or the fridge door is opened, the monitor goes blank for a few seconds.

Both extension cords with surge protection are of different brands. Monitors in both instances are of different brands.

I have a computer that is in another room and not connected through a surge protector that does not have this issue.

Does anyone has an idea why this happens and what can be done to remedy this?

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It could be that mains power is simply weak, possibly under spec at your location(s). To measure the transients/brownout will take some (oscilloscope-level) equipment. Probably the only consumer-level fix is to run these monitors of a good UPS.

Also, have you tried running the monitors straigh from the wall, sans the extension cords? MOVs inside surge protectors fail after a while.

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