Offline printer problem

My HP Photosmart C6150 printer is hooked up to our computers via wireless connection to the Linksys router. After adding the printer to either of our Windows 7 computers, we can only print for about 24 hours before the printer goes offline and will not print any documents in queue. How do I make it so the printer stays connected to the computer for more than a day or so? Here's the specs of our computers:

Computer 1 (my mom's computer):

HP Pavilion case
AMD Athlon 64 X2 5000+ 2.66 GHz
Stock CPU cooling
Asus M2N68LA motherboard
2x1 GB DDR2 667 Dual Channel RAM (not sure of what brand)
Seagate Barracuda 7200RPM 500GB hard drive
Lite-On Lightscribe DVD burner
Lite-On DVD-ROM drive
KFA2 GeForce 9600GT OC
Thermaltake Purepower 500w PSU


Computer 2 (my computer):

Cooler Master Storm Sniper case
Intel Core i7 920 2.66 GHz (Often running at 4.2 GHz)
Xigmatek Dark Knight S1283V CPU cooler with OCZ Freeze thermal grease
Corsair Dominator 3x1 GB DDR3 1600 Triple Channel RAM
Western Digital Caviar Black 7200RPM 1TB Hard Drive
2x Sony Optiarc Lightscribe DVD Burner
EVGA X58 3X SLI motherboard
EVGA Geforce GTX 285 1024 MB
Corsair HX1000W PSU
Super Talent INTAIN1MCR Media Card Reader