Hi, we have 3 ultraset comfort set 151 t28 fd in an office and all three of them are having issues with the handset's speaker and/or microphone (sometimes one, other times both). My partner thinks its the piezoelectric failing (both mic and spk are piezo) . Sometimes hitting the handset with the hand fixes the issue, but as the time passes the issue is getting worse. We changed the handsets but after a few months the issue came back, and its really hard to find replacements in 2019. Is this a known issue? Is there a way to fix this?
Thanks in advance!
BTW, sorry for my english, im'm from Argentina :)
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