yuditst, do not forget, download speed is reduced if using the unit as a repeater. Low signal or loss of signal, try and reposition the repeater for better wireless connection of the unit you are "repeating".
You could also (if possible) change the antennas on both units to 5dbi or something like that. It will give you better quality of the connection. And might give you a speed boost as well, as the low signal does give you bad speeds, regardless of using is as a repeater.
If you are on H/W.C (Rev.C) do not forget to upgrade to v3.04 of firmware if you are on v3.02 for better stable connection.