Upgrading to the firmware 8.0 produced quite frequent hardware faults, so I finally installed the latest revision (8.1b1). After one hardware fault, I checked all settings and restarted the system and have seen no problems since.
I also changed from 1-meter frame antennas to 20 cm home-brew ferrites. Being smaller, I was able to relocate them to an electrically quieter location and this has made a substantial improvement to performance. I am frankly surprised how well these little ferrite antennas work!
Mike