Schiit DACs tend to this something must be technically wrong with their design.
It’s unwise to make the broad statement above by taking an ’n’ of 1 and applying it to a successful product range that likely has the widest (or one of the widest) numbers of absolute users / units (standalone ’audiophile’ DACs) within the U.S.
The OP needs to measure the temps of his unit and report to Schiit for an exchange / replacement, if it falls outside of operating tolerances.