They're not at all far (fifteen feet) from the base and, this loss of signal only started happening about a year ago (the phone is probably about three or four years old).
So, something clearly aged (but the batteries show as fully charged and I've changed them between handsets anyway).
The error I keep getting (on multiple handsets) is: No Link. Reconnect base AC adapter.
This happens after, say, a few minutes of talking time, but, it's erratic. Sometimes I can be on the line for an hour before it happens; other times it happens within five minutes.
What frustrates me is the lack of debugging techniques.
Reconnecting the phone to the charger doesn't change anything; nor does placing each of the handsets back into the mother phone to reinitialize them.
Here's the DECT Panasonic KX-TG6441 phone & handsets: http://farm4.staticflickr.com/3779/11811980883_f540a29bee_o.gif
Here's the model number plate: http://farm6.staticflickr.com/5539/11812098283_c1f2dc22f0_o.gif
Googling for that error message, I see it's pretty common; but I already tried the little that Panasonic suggests: http://eng-na.faq.panasonic.com/app/answers/detail/a_id/12927/~/my-handset-displays-no-link-to-base.-reconnect-ac-adaptor.-what-should-i-do%3F
The outlet is working fine; the phone works fine from the base; it's just the handsets that keep losing their wireless connection.
Anyone else resolve this problem before? Any debugging hints?