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How old is the printer with this problem of repeated jamming?
It sounds as if the jamming is in the rear or back of the printer, that area more or less.
What does 'the diamond button' do? Photocopying?
Have you been using Epson OEM-original ink supplies?
The printer is out of warranty for sure, I think. Unless an extended warranty or extended care plan was bought with it at time of purchase.
What is the exact message on the screen, that says to turn Off and restart? in case it matters, and in case there is any number/letter code with the message.
That is, unfortunately, a general error indication. The printer doesn't know what is wrong... and usually that means that the printer's circuitry is out of order.
I'm sorry to say that the printer may need repairs, or perhaps recycling and replacement, if you so choose.
But I would still like to ask:
I'm sorry to hear that.
One last try, would be to turn Off and unplug the printer, and leave it overnight, in case the problem is temporary and caused by overheating.