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They updated me to 5.9 build 1.51.96 (was 1.51.94) and so far no reboots needed since then. Other than those needed reboots, not a single issue in 2500+ miles (3 weeks) so far.
Rebooted today. The turn blinker sounds were getting erratic. Had it delay for some seconds then rapidly go click-click-click-click, and variations on that theme. Reboot seems to have cleared it.