Sheet kicks me out after a couple minutes

I am the admin and owner of my smart sheet and I have been trying to add some new columns in. After a couple minutes it boots me out with no warning. I get the error "you smartsheet is no longer active" and then I have to log back in.

I am using Chrome and only have a few columns in the sheet so it shouldn't be over loaded. it is a classic grid sheet used for roll up data pulling from a master grid

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