Multiple Sheds on Finasteride. 1 year on Generic Finasteride. Lost ground on hairline.

Hi. Ive been on finasteride for the past 1 year. Shed at around 150 hairs/day for the initial 3 months. Thereafter the next 3 months the shed stopped drastically and started again at month 7 continuing till month 9, where i lost at close to 200 hairs/day. The shed STOPPED COMPLETELY from month 10 to month 12 where i almost lost no hair. The problem is the shed has started again at month 13, and I again lose close to 80 hairs/day. Are multiple sheds common. Hair