Razer Nari Ultimate dosen't connect to Laptop

Hey guys, I have Nari U for almost 20 days. last night i played CoD: Cold War just fine with it. but to day when i wanted to use it again, Headphone could not connect to my laptop. Status light just kept blinking blue light for few mins and the it turned off. also it doesn't show up in Synapse 3. I searched internet and youtube. I did a clean installation of Synapse 3 and Cortex from Razer website. i deleted the drivers from Device Manager and installed them again (And lets just say before this i had a THX output in speakers that it's no linger there). I did try to use different USB port for usb dongle. so yea i'm out if ideas. oh and when i plugin the usb dongle, drivers get installed normaly and It shows up in my In/output list. but still no connection to headphone itself. I don't know what happend during those 5 hours i was sleep. but here we are. Any ideas? Thank you all in advance. :)