I prefer to mess as little as possible with the oscilloscope. In any case, it's been almost a week since I cleaned the pot that MrChips pointed out, and so far I had no more problems.
There is something though that I'm unable to tune: the screen doesn't seem to trace perfectly straight lines (e.g. when you set a channel to GND); they bend downwards a little bit at the right hand side. It's not much of a problem, but it would be nice to set it straight.
There is something though that I'm unable to tune: the screen doesn't seem to trace perfectly straight lines (e.g. when you set a channel to GND); they bend downwards a little bit at the right hand side. It's not much of a problem, but it would be nice to set it straight.