Why does the date and time change on my phone

I set the date and time on my phone and set it to automatic and the boxes in setting uncheck them self's and the time and date change.

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Mine does the same however on one screen the time is correct and when I swipe down for notifications its three hours ahead

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My new Alcatel 1b does a weird date change randomly it will set itself to Thursday 7th 2036 either 7.28pm or 7.42pm . It did this on the first one I purchased and I also lost all connectivity Wifi was connected but no connection and the same with data, I now have a replacement and it's starting to do it again on this one also - I'm baffled

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