My watch won't pair

Hadn't used my watch since mid January and some how it disconnected from my iPhone ,now it starts the pairing process and says pairing successful when it brings the setup screen a few seconds later it says pairing failed asking you to restart process and going through an unpairing the device, really odd but true.I can't seem to find any work around any and all help is appreciated.
thanks in advance

 

Thanks for your reply I erased all content and settings to my watch and to my iphone when I first started the pairing process. I can see my watch on my devices.but do not see it in my bluetooth as a device.

 

Hi
Thanks for you reply I decided to go that route have a case ID will be calling them tomorrow