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Rigol DS1102e issue

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kilomono:
I bought a DS1102e about a year ago. This week I used the self-calibration feature and since that time I have had a terrible problem!  :-BROKE Whenever I turn the oscilloscope on I see a periodic signal on the scope with a frequency of about 100 MHz. A signal appears on both analog inputs and it changes shape, but not frequency, when channel 1 or channel 2 is switched on/off. When the timescale is greater than or equal to 500 ns/div this problem manifests itself as a DC offset. The signal persists even when nothing, other than the power cord, is connected to the scope. I have retried the self-calibration and also reset the scope to the factory default settings and the problem persists. More interesting still, the waveform scales with the vertical scale; i.e. its pk-pk amplitude always appears to be about 6x the vertical scale (e.g. 1 V/div scale: 6V pk-pk amp,  10 V/div scale: 60V pk-pk amp). I have attached shots of the waveforms

I've Google searched this issue (which turned up this forum) and I've also searched this forum and been unable, in all my searching, to find a solution. I've also contacted Rigol Tech support, but haven't heard back from them yet. I'm running firmware v. 3.01

Has anybody else seen this issue? Does anyone know how to fix it?

Thanks!

ATTACHMENTS:
Figure1: Signal on channel 1; nothing connected to input
Figure2: Signal on channel 2; nothing connected to input
Figure3: Signal on channel 1 when both channels are on; nothing connected to inputs
Figure4: Signal becomes a DC offset at timescales greater than or equal to 500 ns/div
Figure5: Signal scales with the vertical scale. Note: Fig. 1 is 1 V/div, Fig. 3 is 10 V/div, Fig. 5 is 2 V/div

kilomono:
Rigol's technical support said they had never encountered my problem and asked me to ship my scope to their nearest office. I didn't want to do that, however, so I tried some more things to fix the scope on my own. I ended up connecting a probe to channel 1 and shorting the probe to its ground clip. For some reason this idea kept pressing on my subconscious and I had to fulfill it. I ran the self-calibration with the shorted probe connected to the scope and after the self-calibration finished the problem was gone. Now I can't reproduce the problem and the scope seems to work normally. I have even tried the self-calibration feature without the probe connected (like I originally did when the issue first arose) and have had no success in reproducing the problem. I wouldn't say what I did was the solution to the problem; however, the problem is gone for now.

Mark_O:
Cool!  Thanks for sharing your experience.

mcinque:
Thanks for sharing, this could be useful. Just for reference: wich firmware version do you have installed?

kilomono:
You'll see in the first post I specified that I am running firmware 3.01

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