Lots of interesting sub topics here. :-)
First, I have heard RF experts on both sides of the issue of whether a kinked or coiled coax will reduce signal level. In general it won't make any difference, but you should try to keep it straight, if for no other reason, to make sure that you don't compress the dielectric between center conductor and shield. However, I don't think a kinked coax would cause intermittant reception as is seen here.
Re the "rodent" thing. Boy can I verify this. Not only will they eat the plastic insulation, but they actually chew up wires. I leave my boat outside in the winter, and the mice and chipmunks have chewed completely through several wires in the electrical system. However, again, while this could cause a go/no-go situation, I don't see it being intermittant.
Bad connections are also a common problem, but unless there is something there moving the wires at the connection, I again don't see this being intermittant, except out at the dish, where wind might be moving the dish enough to wiggle the wires.
I also don't think that RG-59 vs RG-6 is an issue here, as I'm using about 75' of RG-59 on one of my LNBs and it isn't a big problem, except at the upper end of the IF band perhaps.
My suggestion is that this is probably either a reception problem or an LNBF stability problem. Ie reception wise, perhaps the bolts are a bit loose on the dish or perhaps the pole isn't rigid, and perhaps wind, or a bird sitting on the lnbf, moves the dish just enough to temporarily kill your signal. Or, if your alignment is a bit off, and you are actually picking up two different signals from different sats or polarity, and the receiver occasionally locks onto the weaker signal for some reason.
I have also noticed intermittant lock in the past, on two of my receivers, when the freq/SR parameters are off a bit off. I know one time, there was one signal which was posted on another forum as having a 20,000 SR value, and MANY people, including me, were having problems with it popping in an out of lock as seen here. I used the SW method to determine the SR value, and found that it was actually about 20,010, instead of 20,000, and when the SR value was corrected, it stopped popping in and out of lock. This is strange to me now, because I have seen many examples of being able to lock signals which are WAY off freq on the SR value, and still lock fine, however I think that this depends on the receiver. Different receivers also have different capabilities with respect to being able to tune a signal that is off frequency. This is particularly important on narrow (low SR) signals, because many of these cheap LNBFs can drift several MHz, and if the receiver isn't capable of following the drift, you might see the signal go in and out of lock when the LNBF drifts. I know that the LNBF I bought from
Sadoun is 2 MHz low on the average, and drifts up to another MHz or 2 around that, so I sometimes have problems with narrow signals locking. On my FTA receiver, I just set my LO freq to 10752 to compensate, but on my DCII receiver I can't do that, so that LNBF sometimes makes it difficult for me to lock narrow DCII signals.
Anyway, just a couple other possibilities. You might try to change the FREQ/SR values a couple MHz higher or lower when you're having this problem, just to see if it helps.