Charging system malfunction warning

  1. My model of MX-5 is: __ND 30ae
  2. I’m based near: __tamworth staffs
  3. I’m looking for technical help or recommendations on: __Charging system warning light came and stayed on, pulled over switched engine off. Restarted car no problem, no warning lights drove (about 15 miles)home no issues. At home went into home screen warning status monitor, no current warnings showing. Anyone had this ? could it be slipping Alternator belt ? Any help/ideas much appreciated.