Hashrate drops to halv in the middle of the night

My normal hashrate is about 300mh/s, but at 4 o’clock tonight it dropped to about 150mh/s. I know it fluctuates, but look at this picture and you will see it just drops in half.

Anyone know whats going on? Is it a miner software thing, a hardware thing or a pool thing?

To further show whats going on, here’s the hashrate;

Also, there are not a lot of invalid shares:
image

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