I really suggest you look around. Ios 5 on ipad 1 problems are happening across that board. Google ios 5 buggy to see the 10 s of thousands of comments on this.
A patch was due last nov, it was delayed to fix the problems with this release. I can see over 100 crashes submitted back to apple in the last 7 days, And that is just me, this is just two weeks after doing a full reset.