Multiple Virb remote issues

As discussed in this thread I have to fairly regularly have to power down my Virb Elite and power it back on again to get it to re-connect to my power meter.

My setup is a garmin 810 that remote controls my Elite. I also have a Basic that is controlled by the elite so when I start and stop my ride both cameras start and stop.

However after I power down my elite and power it back up again it does not seem to be able to control the basic any more.

Once I stopped both cameras, powere down the elite, power it up, started it and the basic did not start.

I then stopped it again, waited a few seconds and started it and this time the basic stated as well.

I wonder if it's just a case of the basic having to find and pair with the elite after the elite starts up again.

If so how long should I wait before starting the elite so that the basic picks up the signal?

Thanks