I don't use a smartphone, and we don't have cable TV, but I have seen and fixed quite a few PC problems for friends and relatives over the past few years. Invariably, when a PC goes bonkers, it seems to be because it has been hacked by a virus, or malware. With all the trash on the Internet, it is Imperative that a person use a good Anti-Virus, and keep it regularly updated. I am NOT a fan of Windows Defender...which comes with Windows OS...it is Marginal, IMO. I recommend Avast or AVG Anti-virus...both free. I have used Avast for several years, and have had No issues. I also run a spyware/malware program called Spybot...also free. The only disadvantage to these free programs over their "purchased" counterparts is the need to manually update them. Running extra protection on a PC, AND avoiding opening any questionable e-mails goes a Long way towards keeping a PC running good.
We use satellite TV, and about the only time it craps out is for a few minutes ahead of a violent thunderstorm....losing the TV is a clue to make sure all the windows are closed. We had cable TV when we lived in the city, and it was rather unreliable...it sounds like things haven't changed much in that regard.
We just keep a basic TracFone for use when we are away from the house, and it works great....but I suspect that many "Smartphones" are susceptible to the same hacking and privacy issues that a marginally protected PC can be exposed to. If I had such a phone, I would be Very suspicious of Any messages from an unknown source, and If there were a reliable spyware/antivirus "Ap" for it, I would be sure to have it installed and active.