Thule Omnistore Wind out awning problem

[Michael513]

Hi all, my Thule Omnistore awning (think its the 5200 model) has started to catch on its housing channel when opening. When I unfurl with the pole the left-side arm knuckle seems to have dropped slightly in the channel and so wont open more than a few inches before it sticks. If I continue unfurling the fabric starts to fold. So I use the pole to gently lift the knuckle over the channel edge and it unfurls eas normal. On closing when its against the channel I hear a faint click as if it drops down into the channel. Any ideas folks how it might be remedied?