I'm sorry to hear that you can't sit very long comfortably!In my case it is why don't I Dis as much as I used too. I miss it so much.
Two reasons I don't is 1, since I've had this computer (maybe a year), the boards don't act right. Slow loading, jumpy etc. works fine on my work computer tho but reason 2, I can't sit pain free for any length of time anymore so I just pop in occasionally.
The DIS doesn't work properly on my laptop, I usually browse from my phone or my kindle.
I switch to google chrome. Just a thought. 

