Hey, I am an intermediate-advanced player. I play 4-5 times a week for 2+ hours each time. I am currently using a 4U Z-Force 2 as well as a 3U Arcsaber 11. I string both these rackets with BG80 at 27lbs for the Arcsaber 11 and 28lbs for the Z-Force 2. In the past week, I have broken my strings six times all after approximately 2-4 hours of play. I am currently unsure as to why my strings are breaking so fast as they have lasted me around 2 weeks before. I am using a spool I bought online, I am not sure if it is fake but the strings have lasted a decently long time up until around the end of December where the fast-breaking started. Any help is greatly appreciated. Edit: If the string is the problem, what other string do you suggest I use? I use BG65 for training but I change it for tournaments.