I have a Toshiba 1905-S301 laptop that had its power supply blown up
in a lightning strike. I've gotten a new replacement adapter, and the
unit seems to be in great working shape.

Except...

I noticed an oddity when downloading some patches off a wired ethernet
connection the other evening. When the laptop has just been turned
on, everything's great--surfing and downloading speeds are super.
Then, after a while, internet access s-l-o-w-s down. New websites are
slow to load, downloads that were flying begin to creep...

....until I unplug the AC adapter. Then the speeds pick back up, sites
load quickly, downloads are fast.

I've stripped the unit down to the system board and looked carefully
with a magnifying glass. I can see no obvious problems (burnt traces,
cracked components, et cetera). Everything else on the unit's A-OK.

Has anyone else experienced a problem like this?
** To respond, remove the crap from my addy... **