[QUOTE=ChristineBCW;2680136]SAHDISBOSBDTAGABOH?
(This is the logical extension of your fondness for abbreviations instead of real English spellings. I mean, the apparent need to save keystrokes is REALLY aided by this above abbreviation! But to use the correct spellings that are readable, here’s that translation:)
So a hot device is surrounded by other signal-bearing devices that also generate a bit o’ heat?
It’s like a sandwich in an oven. And is there any question about why the middle unit is more like a Reuben than an electronic device?
Since lateral space may be at a premium, the earlier suggestion to “stand them up on end” (vertically) would save lateral space - put them an inch or two apart. That will give much better airflow than these baking goods are enjoying now.
Also note that Signals on a Cable alone will create a static-charge. I dissipate these charges - occasionally - once a week? month? - by detaching both ends of the cable then re-attaching. The disconnected cable will remove all signal-movement, and the re-introduction of new signals is a ‘flushing’ action. A cable with Zero Static Charge will always provide better thru-put.
Your unit can have heat-death, too, where some of its components (like the PCP board) can have deteriorated thru normal use, as well as this oven-effect use, so “replacing” may be the best option.
But stand these units upright, and give them some air-flow space between. That may not solve an already heat-damaged unit, but it will provide a longer-life for all future devices.
(Send me a PM sometime and argue your case for typing abbreviations vs. the easy-reading that full words offer to everyone else. “U” instead of “You” saves two whole keystrokes. Wow. Saving up for ?? what ?? A coffee table?)[/QUOTE]
It’s impossible for a meaningful static charge to build up on a conductor of that sort. We are talking about a antenna cable here? The charge should be uniform as it is a conductor, and the shield is grounded so there’s no free electrons to build up a huge charge. Of course antenna cable has some capacitance as it has two conductors and a insulator between them. But the amount is so small, that there’s no way for signal generated static charge to have anything to do with throughput of a cable modem.
I don’t think that cable companies and tv stations go around re-attaching cables constantly.
Sometimes, especially for humid enviroments, re-attaching cable ends will make a difference, as the wire connector will accumulate rust even when it is attached (it is not hermetically sealed). When you remove connector and re-attach it, this miniscule layer of rust will be wiped away -> everything works again.
But for the orginal poster - the AC adaptor makes noise? Might be normal, might not be. Try with a different AC adaptor (make sure it has enough amps!!).
The title says you drop your connection if used “for a long time”? How long, hours, days, weeks, months?
And some devices will get incredibly hot, and they can handle it. But usually hot is bad, and at least it will shorten the life span of your modem. If warranty is already gone, and you know what you are doing, check the capacitors. If not, do put the box somewhere more less hot… if floor is cold, put it there and as said - sideways.
Once I had a modem which did drop the connection especially when in lot of load. It had two bulged caps, changing them did some good but still I’d get drops. Things changed for the better when I …upgraded the ventilation 
