Slow boot every 24 hours - network issue?

Hi guys This is not a major issue but if I don't switch my laptop on for over a day my boot slows by about 10-15 secs as it lingers on the welcome screen when logging in. If I switch on again within say a couple hours then no delay, only a second at most. I have my laptop connected via wired switch. I thought it may of been down to the mapped NAS drives I had so I created a batch file to map...