svc 4wd lights on

Hi Toyota Rav4 owners, may I ask for your help to solve why my Toyota Rav4 2012 base model 2.5L engine will have a dashboard error lights Engine, 4WD and Trac Off during rainy days and the error lights will be off during dry days? It happened 3 times already. I will wait for your reply about...

Today after starting my engine, SVC and 4WD lights were on, and the car felt running weaker, RPMs were higher than usual. I made it home, but was worry what can be wrong. I check the gas cap, few hoses around air box. Nothing helped, lights still on and idle was off. Than I noticed my battery...