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What phone service do you have? It sounds as if you have Time Warner Cable phone service. Phone service from a 'box' that they provided, that hooks into their cable/internet service line, I presume. Is that the case?
What phone do you have, also, please? the handset that you pick up and use for phone calling, that is.
OK. The cordless phone might possibly be the problem, but it's not by any means sure at this stage.
Try turning Off the cordless phone, when the service has a problem, for about 5 minutes.
Then only after 5 minutes, turn the cordless phone On again, and see if it has improved/cleared up. If it has, the cordless phone may be the problem; If it hasn't, TWC service, or their 'box', may be what is at fault.
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Given that the phone service is through TWC cable internet services, then dropped calls could be owing to a breakdown in internet transmission capability... if it isn't owing to their local 'box' having a problem.
(Is the local 'box' that you get phone service from, plugged directly into the wall outlet? or is it - as is advisable for sensitive digital equipment - plugged into a surge protector?)
TWC should be asked about dropped calls, yes, and asked to test their internet throughput, as it is called, to your account/location/local 'box'. If that throughput suddenly freezes up, the call would probably be dropped.