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If all cameras suddenly started showing the same symptoms, then there may be a common factor that affected them all on the same day.
Here are some factors:
- you could be wearing woolens, promoting a static-discharge-rich environment for the cameras. (Wool, when worn, generates static electricity in abundance, then when you touch a digital camera, its sensitive circuitry gets 'zapped', which can be quite bad for it, whether temporarily or permanently.) Or perhaps you were on a glass plate, or a vinyl sheet? those also generate static electricity and promote static discharge.
- were you operating the cameras in or subjected to, temperatures below 32 degrees F (freezing point) or above about 100 degrees F ?
- were they subjected to a humidity higher than 85 % or gotten wet ?
- were they operated in a gritty or sandy environment, such as a beach, a seaside, a construction site, or the like?
The first thing to try for these cameras: removing the batteries, and leaving them on a (dry, non-humid, non-dusty) shelf for overnight. Then put the batteries back in and try the camera(s) again.