Hi Mike,
Please comment on the post from Bill Baxter at the Futaba support forum:
"Some battery back-up devices might have difficulties with the lower operational voltages as well, although they might not appear to initially. One such device functions perfectly on the ground and during a range check, yet when the operational temperature reaches 50 degrees C (122 degrees F), the device actually requires 2.8 Volts in order to function properly. As such, the servos will cease to operate properly.

Many of the manufacturers are updating or refining their products to ensure compatibility with the lower operational voltages. Should you have any questions about the operation of such peripheral items we strongly suggest that you contact the manufacturer directly".
So if we're using the Futaba 6014 receiver during the summer, which Hitec digital servos have been known to fail due to lower voltage or high temperature?
I noticed that my newly bought 5645 will not run through a Y-connector, just chatter and not move, if using the 6014 rx. That is, I could not run a Y to 2 aileron servos, have to go with single dedicated chl for each servo instead. Have not tested this servo with high temperature test, but heard that someone on RCU crashed at 102F during summer due to servo lock out. And now I'm getting mixed messages about the source of the servo lock out problem. You're saying it's Rx source and Bax saying it's the servo being the source of the problem. I'm very confused...[]