Problems with GPZ 500s !

Hi guys, I have a problem with my GPZ 500s year 90. And it sometimes doesn’t start up and this usually in the morning. The battery can’t be, it’s new. The starter also goes crazy. Unfortunately, I don’t know what it might be. Can it be that something gets wet? Since it usually doesn’t start in the morning and that’s always when it was a little frosty or damp. Thanks for your help.