Sony a5100 used as webcam started zooming out randomly

[Bobslay]

Hi, I have been using an a5100 for two years as a webcam and I love it. In the past three months it has started zooming out fully at random intervals (zooming right out to the zoom level you get at startup). It doesn't seem to be rebooting, just zooming out. 

It maybe lasts 5-15 minutes between each time.

I used the camera on vacation in January but I didn't change any settings (or I don't think I did), the problem has started since then.

I have reset the settings in an attempt to get this to stop, I have gone through the full webcam setup settings process but it still happens.

Can anyone help me, I feel this is going to be a stupidly obvious solution so apologies in advance if I am missing somethings obvious.

Thanks