Gigaset is my choice of brand and I own one.
Alas for yourself, we never got to the stage to determine if Landline was unplugged for a few days, to see whether the phone or extension was root cause of your many FEC’s.
Alas just purchasing a new phone may not help with the FEC’s you are getting?
BTW- how’s your stats looking and did you manage to contact BT for landline fault check ?
Alas it is unfortunately a process of elimination 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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