2-unit system, satisfactory performance for 10 months. Suddenly BOTH units report "no link to base, move closer, etc". Equipment locations have not changed,and the units will still not work when they are placed beside the base.
Base has been unplugged, then plugged in. All handset batteries are charged (tested on a meter).
HOWEVER, the handset antennae icons are flashing on both units. The locator and registration process do not work. Looks like a signal failure in the handsets, but both at the same moment? Not likely.