Thanks to all of those that submitted their ideas as to what might be causing and or potential fixes for the problem I was having. I opened several pdf docs on my tablet, Phone, and computer this morning, and all appears as it should. Don't know what happened, but it appears to be working fine now.
Maybe the missing lines are just hidden by some formatting issue. Try this, download the damaged document to your hard drive. Then open it in notepad to see if the missing text shows in notepad. (I put notepad in my "Send To" just to make this easy.)