A lot of problem WRT54GR with DHCP, gmail, hotmail, google earth, deezer.com ...

My router as a firmware with higher version (but older) that the available version on the Linksys site but that
- My router : Firmware Version: 1.04, Apr 26, 2006
- Linksys site : Version 1.03 6/30/2006
Should I do the Upgrade (in fact downgrade) ?

List of problems:
- DHCP servers bloqued each 1 tot 5 days à power off/on fixe the problem for some time
- Impossible the upload mail attachement on any Webmail (Gmail, hotmail, inbox.com)
- Deezer.com doesn’t work
- Google earth doesn’t work (unable to connect to servers)
- Unable to upload
à all these problem are experienced by various laptop and desktop running various XP or one Vista, connected by wire or wireless to router.
à All these problems disappear if the router is by-passed (PC connected to ISP cable modem)