Hi lovevictoria83.
If using the printer over a wifi connection, check the D1550's signal strength: Press 
<Network Information> <Network Connection Method> <Connect. Info.>
The wifi signal should be Good. If it's lower, it may be fading in and out of connectivity.
If the signal strength is good, and this problem is occurring, check the computer's security settings to ensure the antivirus or firewall are not interfering with the printer's connection to the computer.
If you need immediate assistance with this issue, please contact us using the numbers and information at http://Canon.us/ContactLI
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