Gigaset A415 prima but learned nothing at Fritzbox

This phone is well made and reliable, as well as his
The predecessor A400er. The settings easily.
The sound is clean. It may be the tone to high
Adjust or deep shades. So a rugged phone
for people who want to "only" calls. ! 00 Entries in
Phonebook is quite decent and the price
you can not go wrong.
The device is slightly longer than the 400 series and the illumination
the display is held in light gray. I personally liked
the amber of 400ers better.
However, the device is similar in other characteristics to the previous model:
In direct application of the current boxes Fritz the unit depends
away after a few hours. Means:
Answering calls is functioning properly.
Outgoing dialing by entering the number or select from the Phonebook
or press the recent calls from the call list with the result,
that it looks as if elected, but shall immediately on again.
Remediable by default only by switching off and
Turning on the handset.
Then it works for a few hours.
This can occur by setting the Fritz box in the DECT range through
click a.) "CAP compatibility problems" and
click b). "unencrypted DECT connection"
be remedied.
However, it is not encrypted then go.
I hoped that this error was done with the 415er,
was the reason of Wechses on this device for me.
The more expensive or even older devices from Giga
this problem does not seem to.