Instinct does not connect to smart phone anymore

Since a few weeks my Instinct does not want to connect to my smart phone anymore.

I give in the code that I get from my Instinct into my smart phone, but the app Connect does not show any activities or my day. My watch is always saying "trying to connect to smart phone".

I neither can get notifications of text messages or incoming calls on my watch.

When I bought this watch, all functions worked, but now nothing works anymore!