No point in trying a different power supply or modem with -14db, there's a bad connection somewhere and if fiddling with those inside the premises doesn't help, and in the junction box (if they haven't put a tamper tag on it to show when it's been opened) then it's time to get them to send a tech out. Playing odds it is more likely outdoors (or in an attic above the insulation or under the home in a crawl space) where temperature and/or moisture fluctuates more.I remember it is about -14dB, at work right now so I can't check real time, but it is around that number. Will check with another 12V power supply and see what's going on. Maybe wind blew out a cover somewhere and water get in.
That's unless it has consistently been near that low previously without the dropouts due to multiple splitters on the line, so is only dropping a little from the usual strength, then an amp could help, but it's still degraded below what it should be so the amp is something to think about after seeing what the signal strength comes up to after finding the fault.
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