Galaxy Gear Fit (Disconnecting Issue)

Hi everyone, i recently bought gear fit from dse, but facing major problem, it keep loosing bluetooth connection, very annoying, it's happening pretty much once in an hour, also i did reset the gear fit and still facing, i am using htc m7, but i even tried with my galaxy s5. so if anyone owns it and had this issue, please advice me any solution to fix this. Thanks.