If there is a problem (and I genuinely don't see it) then it's a problem with the Youtube Kodi addon.
The Youtube Android app works well on Q5 / Q10 Pro without problems.
Kodi works well for other non-Youtube purposes on Q5 /Q10 Pro.
You could try posting on the Kodi forum thread for the Youtube app. http://forum.kodi.tv/showthread.php?tid=267160