"sticking" IP address using DHCP

I have a problem of a "sticking" IP address when using DHCP to connect to the wi-fi network in my office. Every time I connect I get assigned the same IP address, usually a high number like 192.168.1.182 or 240. My connection then gets progressively slower and slower.
When I can't take it any longer a I use DHCP with manual address to force a lower number, and then my connection speeds up for a while. The MBP eventually sets itself back to DHCP, however, and then the problem begins anew. Sometimes I then cannot connect at all, until I delete the network and re-add it, putting in its password again. Any ideas what the problem is?

I suspect it's not the IP address per se but your changing of it that "speeds" up your network access, and it's likely because of interference or other environmental factors.
The issue with Wi-Fi connections is the transmit rate constantly changes as interference and other factors do.
The next time you connect, click the AirPort menu bar icon while holding down the option key and note the value shown for "transmit rate." Later, when your connection slows down, do the same and see if it's changed drastically.
Also note that "forcing" a lower number is likely wreaking havoc on your network, as you're in all likelihood stealing an IP address from the router's DHCP range that it doesn't know is in use and therefore it may assign it to some future client.
I'm sure your IT folks, if any, would also have an issue with what you're doing for the same reason.

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