Molting Hermit ?

sometimes hermits crab just like to burrow them selfs and you won't see them until night time because the nocturnal, or yes they may be molting heres some question i got for you.Have it been eating a lot before it has burrowed under ground, because if it did they may be storing food for the molt because hermies may stay down the substrate for more than 2 weeks and developed a food sack heres what i think you should do, just stay up late on the weekends and check on them every hour and see if they come up to eat and climb around, if they do then yes your may just be loving the substrate that you bought them