If the issue happens at the exact time intervals, and is visible on SD-card (which is close to sensor and doesn't need ribbon), I doubt that.
Since in Ph3 Std both sensor and Ambarella is contained in the moving part of the camera, the issue is definitely there. Easiest fix would be to just replace that whole part.
For specifics - it is hard to tell. Maybe quartz doesn't keep the frequency and that makes the sensor generate signal which is not readable for Ambarella. Maybe one of the connections to Ambarella is weak and too high resistance. Maybe SD-card has an issue, forcing Ambarella to repeat writes, and then Ambarella gets overloaded and cannot keep up with reading the sensor in real time.
I know some will disagree with me
You are probably right here.
but I think these machines are not really for DIY .....
But I'm not sure how exactly do you understand that. Most corporations want you to think their products are somehow so advanced that noone can open it without causing disaster. But all corporations consist of people, and these people were somehow able to make the product.
In case of Chinese drones, automation is actually limited and many tasks are made manually. Real Chinese people are making these drones with their hands.
Make sure your narration isn't hurting the consumer market, or the environment.
The fight for Right To Repair will take years, and corporations will try to convince general public that devices can't be repaired. They will continue introducing solutions which make unauthorized service harder. Even in Ph3 Gimbal, there is an encryption chip - which is normally unused, but makes sure that all chips within the gimbal share the same key, and otherwise puts them into "authority level 0". On newer drones, there are multiple layers of even stricter protection. Not user protection, just a protection of the corporate interests.
This is not benefiting the users.