Hi. My watch is a Pionier with Reference Number GM518-4, with gold case and blue dial. I have worn this watch everyday since I bought it, only removing it to shower or swim, so plenty of time for it to self-wind. I have also hand wound it once a month according to the instructions I was given. I have had the watch almost a year but in May it started losing time - an hour or more overnight on three occasions- without me doing anything different. Please remedy this defect or replace the watch. thank you. 



