Leash problems

What's up guys.
I've got 2 leash problems with my boards. The first one ripped off in half when I was surfing. The waves were bigger than the average I use to surf, about 5-6 feet (not much, I know, but where I live the waves are usually 2-3 feet). When I got to the beach and took a deeper look, I saw that it was all full with little rips (that were probably already there for a while, but I didn't notice). Why do you think it happened? I washed it every time I got out of the water... One last thing, as my board is a little big for me and I am very light, I can't duck dive, so I constantly let my board go and dive to avoid the waves, do you think that might have caused it?
The second leash problem is with my other board. It always get tangled in my feet and I end up falling. It's very annoying, happens every time I go surfing. I don't know if it is too small or too big... My board is 6'2'' and the leash about 6'8''.
Thanks a lot,
Brunop
I've got 2 leash problems with my boards. The first one ripped off in half when I was surfing. The waves were bigger than the average I use to surf, about 5-6 feet (not much, I know, but where I live the waves are usually 2-3 feet). When I got to the beach and took a deeper look, I saw that it was all full with little rips (that were probably already there for a while, but I didn't notice). Why do you think it happened? I washed it every time I got out of the water... One last thing, as my board is a little big for me and I am very light, I can't duck dive, so I constantly let my board go and dive to avoid the waves, do you think that might have caused it?
The second leash problem is with my other board. It always get tangled in my feet and I end up falling. It's very annoying, happens every time I go surfing. I don't know if it is too small or too big... My board is 6'2'' and the leash about 6'8''.
Thanks a lot,
Brunop