Maintenance for the week of May 25:
• [COMPLETE] ESO Store and Account System for maintenance – May 27, 6:00AM EDT (10:00 UTC) - 4:00PM EDT (20:00 UTC)
I think it's because those new enchants from masters weapons are being used all the time, when other enchants of the other normal weapons are not active 100% of the time, you just get it at certain times.
it is ridiculous that a full charged master bow cannot withstand a 5-10min fight! In vdsa i have to charge it before every lvl and i m sure it drained out before the combat ends!