[Ultimaker 2+ .. adding time to prints and then fails]

I have an Ultimaker 2+ that is now failing prints and adding time to prints.

Current Setup

Ultimaker 2+  current firmware 5.2

Cura 4.0- fresh reinstall with no modification to settings 

Material is Ultimaker PLA

 

Model is loaded into Cura and sliced showing 3.5 hour print time

Model is saved to SD card for printing

SD card inserted and print starts with progress time showing 3.5 hours to complete

Print starts off great.. then sometime about 1 hour mark it starts to add time for completion...  currently now at 36 hours?????  Print will eventually fail as if its skipping layers

 

Anyone else had this happen????  Printer is a few years old with low use on it..  I have changed out the nozzle , updated the firmware, reinstalled cura ... still same problem... what should I do next

 

Thanks in advance for your help!

 

James