Mine were coming apart two to three times a day. In the grand scheme of things not a deal breaker, as they take moments to refit with the widget but frustrating nonetheless and when you consider what you can clean/earn in even a few minutes, its a waste of precious time having to keep refitting them.
I spoke to Gardiners and was given some suggestions to try. In all fairness these were on the website, I just hadn't seen them.
My problem appears to have been largely due to the fact that I was using the swivel adapter on my brush. When you buy a brush with jets from Gardiner, it comes supplied with the 'T' connector and jet hoses. The length of these hoses is fine for a fixed brush adapter but too short in my view for a swivel adapter. This can be compensated for in one of two ways.
No.1 Increasing the length of the section of pole hose between the top of the pole and the 'T' connector and making sure you clamp the hose in some way at the top of the pole to stop it slipping back down the pole (especially important if you use a Univalve), and or...
No.2 Increasing the length of the jet hoses
The first suggestion is probably the most important of these suggestions as even if you don't use a Univalve, every time you extend the pole you will likely be pulling on the jets unless you fit a straight connector below the 'T' connector at the top of the pole.
So far this week, since I've put this suggestion into practice mine haven't come apart.