Evotouch showing hourglass on 6 out of 8 zones

Hi there,

I have this evotouch system I have installed myself with evotouch, BDR91 and 8 x HR92 controllers (since many years now ...) , but this is the first time I see 6 hourglasses on the evotouch (out of the 8 zones) appearing at the same time, even for heaters located very close from the evotouch ...

Do you know what this means ?
As I write this post, a bit after midnight, it looks like they are slightly coming back all (at current only 4 hourglasses out of 8) ...

Could it be an upgrade of the system or ... ?

Many thanks !