L322 No drive unless turned off and back on!

Good evening.
I am quite new to the forum and L322 ownership. I did ask if I had an issue where as the when the L322 is started, it wont move off in Drive. I needed to select one of the low gears manually, and off it would go
On Monday, I lost drive completely. I have had many vehicles before, so as a last resort, turned it off and restarted. I thought just a minor glitch. However, in slow moving traffic it lost drive again. Same process then managed to pull off the road.
So it's now at a BMW and LR specilasit. There first check reported no communication with the gearbox.
Just wondering if any ideas I can offer them to try?
Many thanks. Carlos.

Have you followed any of the advice in your other thread(s) especially the sage advice from the legend that is Bemble (RRPhil)????

Hi.
Well, the issue now is that when I select D, it drives for a short time. Something happens, it then loses all drive. Turn it off and on, and off you go again selecting Drive.
Therefore it's something electronically..
Any ideas?