I use a WISI OR 152 set-top box to receive a DVB-C TV signal.
A couple of months ago I rearranged my living room and as a result I had to connect the receiver to the wall outlet with a rather long (~4m) cable. Probably not surprisingly, signal quality deteriorated significantly. However, what I do not understand is the following: I have the impression that the signal is getting worse over time in general and seems to change over the day as well (better in the morning, worse in the evening).
My question is: What could be the reason for this and what can I do about it? Should I buy a higher quality cable? Or are there any signs that in fact the receiver might be the culprit?
To describe the current situation in more detail: There are some channels with in general quite good (audio and video) quality. However, in particular during evenings, even when watching these channels sometimes the video freezes and there are "squeaking" noises distorting the audio signal. Other channels suffer from much stronger distortions, up to a point where there seems to be no signal at all.