Old issue also exists with InfluxDB. (RPI3, OH2.2, InfluxDB 1.4.2)
Data from MQTT sensors is stored intermittently: (strategy = everyChange, everyMinute)
Data from Homegear ( strategy = everyChange, everyHour, everyMinute) shows set temperatures are unaffected, wall thermostat was not affected but valve position data dropped out at 3:00 AM.
However, for another wall thermostat there was no data recorded after 3PM.
I did a full re-boot to recover (did not try restarting openhab).