"LAN-side UDP Flood" is not an accident nor an error in the hardware. It is almost always a deliberate attempt to ruin your Internet experience.
I doubt it's the websites that's causing it, since at those times I mainly browse through common sites (hotmail, news, youtube, etc.) and assume they're safe.
If there is indeed an attacker, does that indicate that my computer has been comprimised/infected or is it a network issue?
My computer has no signs of infection and my antivirus is always on (I have adblock on and disabled java and to some extent flash). I also monitor my bandwidth usage and don't see anything suspicious.
On a second note, I have a lot of logs that fill the page including: "TCP- or UDP-based Port Scan", "SYN Flood", "IP packet w/MC or BC SRC addr", "Illegal TCP header".
The targets and sources include ip adresses within my home network (other devices) that begin with 192.168... and the others I don't recognise and assume are from outside sources. It also shows my ip address being a target of "IP packet w/MC or BC SRC addr".
I have no idea what this means, could someone help?