Memory.dll: all alloc attempts failed for size 6407685

[dwt110]

I have gotten this error twice when playing so far in the last 3 days since I started playing PR again. It happens randomly (just happened while waiting to spawn in) and I can still hear people in the server talking on mumble (but the game is frozen) then when I close the error box the game crashes and closes.

I tried the command prompt thing to increase memory size for programs to 3gb but just wanna be sure there isn't anything else I should do to avoid this from happening again.

Specs for those curious:
Dell XPS420
Intel Core 2 Duo 3.00ghz
Nvidia GeForce GT 520
Ram: 4GB total

I run everything on high (sound is all default settings) and only occasionaly get some frame rate drop if I zoom in on smoke/particle heavy things.

1080p screen