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Sounds like an earthing problem to me. Main culprit is water ingress into the back light clusters.
Check the connections to each bulb / cluster on each sideare tight and corrosion free. If they are corroded or gone green you may get away with rubbing them back to metal with sandpaper etc.
Also check that all the bulbs are OK and that one of them hasnt blown ? Check the brake lights as sometimes if a filament gones in the stop and tail bulb (brake light) then that can cause issues.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo