Tony, from what I can find there is no simple fix just a return to dji for a €160 +€60 labour charge for a repair which their Firmware seems to be the root cause of.
If you have done a recent FW update and have lost video to your mobile device, look in the hidden files, see if 0800 device not detected appears, likewise for 1500, if so dji are happy to tell you it is an air encoder issue and where to send it for a repair. And guide you to cost of repair !
I was in chat with tech spt this morning, asked why they STILL, have a Fw update with KNOWN flaws all I got back was " Sorry about the issue"
If these guys were motor vehicle manufacturers they would be legally obliged to, 1 prevent any further downloads until the problem is resolved, 2 recall any affected craft,3 reimburse any costs to previous repair rectified owners.
They have in a nutshell got by the balls.
If I were to write a piece of software that I found caused issues I would remove it from the public domain until I knew it was stable. Not continue to let people download and ruin more craft for 2 years.