My Dlink DIR 615, is working good but once a day it is stop working and I have to do soft reset or hard reset to get it up running again. I have done the factory setting and Crash reset and still I have a same problem. everyday I have to do the same. Can any one help me? Thanks
First check if there is any firmware updates, check out d-link ftp directory for these.
Take some notes about usage, how many users when lockup occur. Does problem occur only under heavy load (lot of connections, lot of half open conn, specific protocols, how many arp users, dhcpd problems are also common). Check if there anyting found from device logs.
Try to use minimal features if possible: static ip's, no routing other than default, simple firewall with drop (do not send error responses), wlan disabled, access control disabled, ... disabled. If it works try to enable needed services one at time and see if it crashes to find problematic settings/services.
To name few other possible causes it can also be bad powersupply, dust, temperature, broken capasitor(s) ...