disconnection

Hello everyone, I am new member, but I read this forum 1 year, I wanted to ask
if you can help me solve my problem, I always disconnections of devices, sextant ros911, 912, 5GHz 18 db

  1. lost connection not polled for too long.
  2. lost connection Extensive data loss
  3. lost connection, received deauth: sending station leaving (3) or (1).

you have any solution?
thank you very much

sorry for my english. Use google translador