NM looses connection and/or doesn't use dhcp

[Xamindar <junkxamindar gmail com>]

I have started to have some problems with networkmanager lately.  I am 
running version 0.6.5_p20070823.

First thing:  when I come home from work where I was connected using a 
static IP (at work I stop NM, set the static IP, then on reboot the PC 
goes back to it's dhcp settings) for some odd reason NM keeps setting my 
work IP and doesn't renew the IP for my home network.  This is a recent 
occurrence and I can't figure out why it started doing it.

Secondly, at random times I will loose my connection.  The IP is still 
there but I think NM messes up the default route info.  Restarting NM 
fixes it or simply setting the default route manually does it.  Why is 
it doing this?