Fixtures not waking up initially

[alg]

Following a summer break, with addition fixtures being added, I have found that the the LED fixtures would not initially respond to the desk. Randomly they would start working and respond to being faded up and down, this wake up time was random with some taking seversal minutes to respond to the desk. I would see the DMX output was under the control of the fader but the fixture was not responding. Using the identify feature the fixture could be flashed. Since programming the desk for the first production of the season the fixtures come up on cue.

What could cause a fixture to behave this way, this is clearly not a hard fault as the fixtures do in the end respond. The fixtures are ETC Coloursource Fresnels and Junior spots.

This doesn't seem to make sense, any suggestions?

[DALX]

If you are using the system dmx output monitor, you may also need an external dmx monitor, in case it was a desk output problem. I have not had a problem with using the desk system dmx monitor, I find it a useful feature. As the fixtures have been responding since reprogramming the show, it appears to rule out a dmx cable, unless you have moved a cable, which may have "cured" the fault.

Edited August 30 by DALX
Changed is to was for past tense.

[alg]

Yes using the DMX monoitor under the Z key. Show now finished.Will monitor as we move onto a new production to see what happens. I can't see any rational explanation why the fixtures should have behaved in that way. No cabling or other changes. The only other factor that may impact is that prior to programmiong the desk we have been using the remote app whilst focussing, the app wass till connected, could that have any impact?