scandisk ssd plus 480gb keeps going to sleep.

Using Windows 7 on a Lenovo laptop with 8 gb of ram.

Since installing my ssd drive in december my computer keeps putting itself to sleep randomly for no apparent reason and it takes a long time to get it to wake up again.

I have checked all the power settings which are correct. Have also tried setting them so it will not power down the screen or put the laptop to sleep but it still goes to sleep.

Getting a bit fustrated with it now so I have  put my old normal drive back in the laptop and it all works perfectly as it should.

Help please