Startup bug OSX

Ever since i started playing LoL (On OSX/Mac), there is a startup bug in LoLPatcherUX. Very frequently, after starting, an error occurs telling me 'Another instance of the launcher is running. Do you want to terminate it?' I can click 'Cancel' and 'Ok'.

It is annoying this pops up, even if the Mac made a fresh/cold start. If I press 'OK', the instance does NOT terminate, but if I click 'Canel' it does?

It appears to me that some kind of process-lock remains after PatcherUX was terminated.

Are there any other OSX Summoners that experience this issue?

Brgds, Merenhor