Air Suspension fault

I have an annoying intermittent problem on my air suspension. I have a 2005 Diesel Range Rover Vogue and perhaps each day my dashboard might show air suspension inactive and the light on the manual control goes out. Sometimes the vehicle drops height other times it doesn't. The fault may or may not happen, it rectifies itself and then happens again, when it rectifies I can use the control to raise or lower the air suspension as normal. I feel it is something electrical, sensor or even a battery power supply problem, nothing exact provided on a diagnostic.
This is occasional and no paternities to it, it can happen whilst driving and rectify itself so it doesn't appear to be something when parked up. I have guy telling me it may be a leak of air pressure but surely that is a consistent problem?
I also have a faulty rear window at the minute that just needs putting back onto the mechanism but at the minute slips down, would this cause a drain on the battery and indirectly affect the power to the air suspension?
Any ideas appreciated! Confused.

Could be leak at compressor, valve block, lines, tanks or bags. May be intermittent as the pressure drops over time.
Could be electrical as you say, could be more than one thing.

I’d get some pressure in it then gently spray every line, air bag etc on the air system look for bubbles. If no leaks get it on diagnostics then you will know for sure

Thanks for the reply, will check that.