Roll oscillations due to servo voltage?

I notice that recently sometimes a strange behavior appears on my plane, after few minutes a increasing oscillation of roll attitude appears.

In following flights it had disappear completely .

Could it be related to servo voltage that looks to me quite low .

What should be a good constant value for servo voltage ?


a closer look let me think it is not related to servo voltage which have a separate 3A Ubec but rather a software problem related to saturation of servo outputs .

The behavior disappear after rebooting

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