Any half-decent fork requires maintenance, the air variety of XCR not being an exception. True, Suntour does not seem to publish XCR-specific docs compared to other higher priced forks like Auron or Axon, but there's a general fork manual available. Some relevant quotes from it:
after every ride: Clean the fork tubes and dust seals and maintain with an oily cloth / check stanchion tubes for scratches
every 50 hours: Maintenance 1 (at dealer)
every 100 hours or once a year: Maintenance 2 (at dealer, ideally before winter time in order to protect all parts from the effects of weather by proper greasing)
Check function of fork / check torques of mountings screws and nuts at dropout (10 Nm) / check
for scratches, dents, cracks, discolouration, signs of wear and signs of minor corrosion (maintain
with oily cloth).
Maintenance 1 + disassembly / cleaning the entire fork inside and out / cleaning and lubricating
dust seals and slider sleeves / checking torques / adjusting to the riders liking.
Before disassembly, check the slider sleeve play of the fork. To do so, apply the front wheel
brake and gently push the bicycle back and forth at the handlebar stem shaft. Replace the slider
sleeves if the play is too big (more than 1 mm at the fork brace).
I'd advise to contact the venue you bought the bike from and even SR Suntour itself for further details.