[out of material errors printing with PETG during transition from walls to top surface]

I get consistent out of material errors when printing with PETG after an hour or so of printing. It seems to happen when transitioning from the walls (imagine a cube) to the top. Every time. Pressing the button to resume will usually continue without error, but sometimes it will error out again but finish with another resume print button pushed. Ultimaker S5, current firmware, Cura 4.11.0, Pushplastic brand PETG. The rest of the prints are great, no issues. Any ideas? 

[print head lift switch won't work after removing and re-inserting the bowden tube]

I put it back in and the bowden tube will lock in place but if it is in place the lift switch won't lift the extruder #2 and lock in the forward position. There may be a small tube that goes under the keeper but I can't find a parts diagram to show how it is assembled. Extruder #1 looks as though it has a small tube under the keeper that isn't on #2. 

 

[print head lift switch won't work after removing and re-inserting the bowden tube]

I did the cleaning procedure for print core #2 on an S5. When I performed the cold pull the keeper for the bowden tube came out. After putting it back togther the lift switch won't lock in the forward position with the bowden tube in place and I get the error that the detected difference between the print heads exceeds realistic values and the printer stops.