"Batteries drain quickly even if new"に関する回答might want a new motherboard. i have same problem and have enquired with Canon and local camera shops. labour, postage and parts could be around £100. unfortunately it may not be worth it. I don't use mine that often! parts for this model are discontinued with Canon as from November 2017. you would want an estimate and diagnosis before any work would be carried out,to be sure! around £40. check if the shop can fix it and carry the spares!