Wired thermostats go offline, wireless stay active
I have a set-up with three main heating circuits, each controlled by a wired smart stat, and another three rooms where the rad is controlled by a wireless smart stat. The wireless stats stay online but the wired ones have started dropping offline on a frequent basis for no apparent reason. I've checked and change batteries and reset the stats but it makes no difference - I go on the app and the three wired stats are all offline. They only go off (or back on) together, never individually. Any ideas?
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