Proform 520 continuous stopping.

Hi everyone,
I have a Proform 520, on which I've done all the regular maintenance and that has always worked flawlessly, but in the last period it will stop after some km. If I set the speed to 0 and bring it up again, the treadmill star working with no problem for some time, and then stop again, is not always the same, sometimes it will stop 1-2 times in 10km, sometimes 8-10 times for the same 10km at the same speed...
What can it be? And what can I do to resolve this issue?
Thanks and greetings from Italy!


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