Spuruious No Power Output

I have noticed an increase of occurance of transmitter dropping down to zero w output during a CW transmission. Just noticed this three times on 40 m right now. I am using a 6500 with 2.5.1 and Maestro, set to 25 w o/p driving an amp, all hooked up with cables. Searching the forum I notice this is not a new problem, it has been reported several times over the years. But somehow it has gotten worse lately (2.5.1?). By cycling to receive and start transmit again, magically the power returns. At a few instances I have noticed that the panafall shows zero output but the amp keeps on showing o/p, but is very rare, most of the time if output goes, the panafall shows no output either, but still in transmit mode. Also, very seldom, I can get power back by keep on sending CW, not reverting back to receive, usually I am in a QSO and want to keep on transmitting so rather than investigating the problem I just let the t/r relay drop. I understand this is a hard problem to nail as it is very random, and I have yet to see any pattern. I would like to hear from others to see if this is still a problem for other or if it is just my installation. At first I suspected my router as I sometimes see high latency (even if beeing on wired LAN) but today not so and still had this happen.