I bought a Squier Bullet Strat about 3 months ago from Bhatia Musicals, Delhi ... But it had some issues, especially with the tuning ... So I got it fixed from OnStage last week and they fixed the action and the bridge setup ... But while the other 5 strings seem alright now, the top string consistently has an annoying buzz and has to be re-tuned every now and then ... I need your advise on what is the problem and what should I do ??? I'll be really thankful to you guys