I have stereo speaker + subwoofer connected to my win10 laptop via AUX cable. Sometimes, while watching videos, the speaker seem to break to mono and only the left speaker works. First I thought the problems are the (a bit older) speaker, but then I realized, when I reinsert the AUX cable on my laptop, it works again for some times. That's why I think the problem isn't by the speaker. What do you think is the problem? Tell me if you need more detail.
Prime causes - cheap sockets & dirty contacts.
- Cheapest solution - switch everything off & plug/unplug the plug in/out of the socket 50 times [gently].
- Slightly better solution - do the same, but spray the sockets with contact cleaner first.
- Prime solution - a new socket, but that requires you already own the necessary soldering equipment & ability to take the unit apart.
If you get as far as 3 without existing equipment, it's probably cheaper to buy new speakers.
In all instances, make sure everything is switched off before you do it. If you use contact cleaner, allow an extra half hour to be sure it's fully evaporated before powering up again.