Black moving stripes on the screen. Can it be problem with RAM?

The phone has experienced a series of sudden screen blackouts (black moving stripes on the screen) along with getting significantly hotter. All the blackouts lasted for several seconds and led to a shut down.

Soft reset helped for about 3 shut downs, but after this the phone has stopped responding at all. I got an error when have tried to update it through DFU mode. Also iTunes didn’t show serial number of the phone.

I took it to the local service center. After diagnostic they said that the problem with the RAM and they can’t fix it.

But now I can turn it on and even uploaded firmware. Unfortunately the screen has had blackouts again right over an apple logo and the phone restarts until the battery dies.

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Can you please tell me, if this behavior sounds like RAM is damaged indeed? And is it worth trying to fix it or the service guys were right about it?

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