Ionic vibrating and flashing the frozen thermometer icon

[Spookyrooky]

All off a sudden my fitbit ionic just switched itself off with over 50% battery power, ive tried 2 chargers, and it either comes up with the fitbit icon, or it's constantly vibrating or flashing up the frozen thermometer icon (which I don't see why as its shorts and T-shirt weather 19 degrees here in Scotland, UK) but it's constantly switching itself on and off, or just permantly staying off after switching on for a few seconds.
It's driving me nuts!!

Moderator edit: subject for clarity 

[LiliyaFitbit]

Welcome to the Fitbit Community, @Spookyrooky.

Thanks for the details shared in your post and for already trying to resolve the issue. I understand how you are feeling about this situation and recommend restarting your watch: How do I restart my Fitbit device? After that please connect the device to the charging cable and check if your Fitbit device is updated to the latest version: How do I update my Fitbit device? 

[Spookyrooky]

Nope nothing worked, watch doesn't even turn on. 😢😢

[LiliyaFitbit]

Thank you for your reply, @Spookyrooky.

I am sorry to hear the issue persists, thank you for your efforts. I recommend getting in touch with our Support team so they can look deeper into the issue and help you with this matter. Click here to get connected with them via chat or phone.