Sound goes off after a few minutes playing(Marshall DSL 401)

Hi guys,
I've got a problem with my Marshall DSL 401.
I guess it is the tube issue, but not too sure.
Symptom is simple. After a few minutes of playing my Fender Strat on it, the sound just disappears in around 5min.

Would this be power tube and/or preamp tube issue?

Any advise are welcome.

Thanks in advance.

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