Internet keeps disconnecting and reconnecting frequently

Ever since I had my fiber line replaced earlier this week, my internet has been very unstable and would disconnect every 10-20 minutes. Everything would be fine and suddenly my modem would be flashing red slowly and reconnecting after a few minutes. Earlier this week the fiber box outside on the wall fell and it had to get repaired, and after it got repaired this issue has been happening non stop. I tried factory resetting it and other methods I saw online but nothing seems to work.