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A7IV in manual mode jumping ISO accidently


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I have a 3 months old Sony A7IV and I noticed that in manual mode (aperture, shutter speed and ISO are fixed), the ISO is jumping to 10000 every now and then. This happens when I am in indoor taking a dance concert event photos. I am forced to switch off and then switch On the camera to get my original settings back (ISO 640, A - 2.8, S - 1/200). This had happened in 3 events so far. And found that issue was happening for both Sony 1.8 and Tamron 28-75mm f/2.8 Di III RXD Lens for Sony E. Wondering if this has been a problem with anyone else and if there is a solution available for this issue. Thanks in advance.

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Reviewed the image info again and found that the camera is switching the mode from manual to A(perture), not just the ISO. The dial still shows M. I see that Shutter speed and ISO are changed, Aperture is at 2.8. Had to switch off and on the camera to bring back my M mode settings. Not sure whats happening and what the solution is.

Edited by photo_enthusiast
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