aqualisa quartz

Hi all, Looking for thoughts on the following problem. Bought a house which has a relatively new looking aqualisa digital shower (single outlet). Its wonderful, for 6 mins 43 seconds...then pressure drops, its struggling to maintain temp (digital screen states "warming") and digital box...

Hi All, just checking I'm not missing something daft with our new aqualisa quartz. The main controls work perfectly, however the wired remote button doesn't do anything and the blue light on it is on permanently. Nothing changes on the remote button when you use the shower. Plumber is at a loss...