Problem sa zvukom tonemach t1

Greeting. Can someone help me? I have an L1 and a Tonemach T1, after working for about 1 hour, the display lights up and distorts the sound. what’s the problem?

That kind of sounds like heat. Is ambient temperature too hot where the equipment is placed? If affirmative, a makeshift workaround is to use a fan to blow air over the case.