I'm using a fat bike rear hub (Sun Ringle). It malfunctioned twice in less than a month riding everyday in winter ❄️. It stopped turning at all so I had it serviced but then it stopped again when it got down to -37°C.
I do not know the exact causes other than grease durability of parts etc. Could this because I didn't use a winter-specific grease, or would it be indicative of a manufacturing or quality problem with the hub?