Knobs a/b controls suddenly dead on MDO3054; Bug?

I was trying to set wave persistence time in my MDO3054. Then I realized I was unable to set persistence using 'a' knob. I was able to set it using the numeric keypad though. Then I tried to move the cursors on the display. No way. Apparently these two knobs did not work after entering persistence setup.<br> I had to restart the system. After restart knobs 'a' and 'b' started to work again.<br> <br> Firmware version: 1.30.<br> <br> Looks like a bug to me.

Hi Luis,<br> I was able to keep using the knobs while on the same firmware and setting the wave persistence.<br> <br> What were your other waveform display settings?<br> Do you consistently have this issue every time you enter this menu?<br> <br> Best,<br> Iris Xu

<p>It fails from time to time. When it fails it happens always when setting waveform intensity. So this seems to be the door to the problem. My waveform has nothing special. I am using 4 analog channels plus some digital channels. I work a lot with the zoom and panning tools. Usually i do not change the intensity. But, after the first crash i have tried it several times just to be sure it wont happen again. Unfortunately it keeps crashing. It is not systematic. I could not tell which sequence of events is exactly triggering the problem.</p>

Could you also try going to Utility--&gt;Utility Page--&gt;Self Test--&gt;Self Test Menu--&gt;Loop 1 Times--&gt;OK Run Self Test?

<p>All tests pass ok.</p> <p>However, in the Error Log i can see several &quot;user interface&quot; errors, some of them from May 2023.</p> <p></p>