I have a large Smartsheet with 1472 rows, 30 columns and about 27,200 cells with formulas, mainly IF() functions plus three simple conditional formatting rules. The page will load in a few seconds and simple changes save in a few seconds but if I insert or delete a row near the top of the sheet, or move some rows from near the bottom of the sheet to the top of the sheet, when I try to save it, after a few minutes, I get an error box with "Unable to reach Smartsheet, check your internet connection" and the changes have not been saved. My internet connection is fine. It feels like I'm running into some hidden Smartsheet limitation. I understand that moving a row from the bottom of the sheet to the top requires virtually all cell references in all formulas on the sheet to be revised and that takes time but I'm willing to wait and planned to organize the sheet to minimize this type of thing as I've done in the past. Anyone have an idea what's going on?