[Extrusion aborted due to Cura temp changes]

I have been going crazy trying to work out why my prints abort some way through. Turns out that Cura generated G-code is changing the extruder temp, up intiially then progrsssively down until the extruder is too cold, and then Octoprint aborts the print becuase of a cold extrusion error.

My temp setting for the print was 200C - however I noticed that after a while the temp was bumped to 220C

When I go look at the G-coide, I see the temp increased on an M104, then progressively dropped to 165 at which point extrusion is aborted (abouit 12 hours into the print in the last case)

I am running Cura 5.2.1 

Could I get an explanation please and a fix?

 

Here is the generated G-code

;Generated with Cura_SteamEngine 5.2.1
M140 S80
M105
M190 S80
M104 S200
M105
M109 S200
M82 ;absolute extrusion mode
[...]
;TIME_ELAPSED:1818.461895
;LAYER:5
M117 INDICATOR-Layer5
M117 DASHBOARD_LAYER_INDICATOR 6
;TYPE:CUSTOM LAYER
M104 S220
M106 S182.1
;TYPE:WALL-INNER
;MESH:Body1.stl
G1 F3600 X166.099 Y166.47 E2386.42539
G1 X165.721 Y166.458 E2386.43799
G1 X165.279 Y166.274 E2386.45394
[...]
;TIME_ELAPSED:8052.156295
;LAYER:57
M117 INDICATOR-Layer57
M117 DASHBOARD_LAYER_INDICATOR 58
;TYPE:CUSTOM TEMP
M104 S215
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:12019.145163
;LAYER:109
M117 INDICATOR-Layer109
M117 DASHBOARD_LAYER_INDICATOR 110
;TYPE:CUSTOM TEMP
M104 S210
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:16044.143848
;LAYER:161
M117 INDICATOR-Layer161
M117 DASHBOARD_LAYER_INDICATOR 162
;TYPE:CUSTOM TEMP
M104 S205
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:20240.928604
;LAYER:213
M117 INDICATOR-Layer213
M117 DASHBOARD_LAYER_INDICATOR 214
;TYPE:CUSTOM TEMP
M104 S200
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
G0 F12000 X271.477 Y280.601
;TIME_ELAPSED:24012.535417
;LAYER:265
M117 INDICATOR-Layer265
M117 DASHBOARD_LAYER_INDICATOR 266
;TYPE:CUSTOM TEMP
M104 S195
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:27812.638552
;LAYER:317
M117 INDICATOR-Layer317
M117 DASHBOARD_LAYER_INDICATOR 318
;TYPE:CUSTOM TEMP
M104 S190
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:31689.972488
;LAYER:369
M117 INDICATOR-Layer369
M117 DASHBOARD_LAYER_INDICATOR 370
;TYPE:CUSTOM TEMP
M104 S185
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:35551.093250
;LAYER:421
M117 INDICATOR-Layer421
M117 DASHBOARD_LAYER_INDICATOR 422
;TYPE:CUSTOM TEMP
M104 S180
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:39279.711465
;LAYER:473
M117 INDICATOR-Layer473
M117 DASHBOARD_LAYER_INDICATOR 474
;TYPE:CUSTOM TEMP
M104 S175
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:43002.588193
;LAYER:525
M117 INDICATOR-Layer525
M117 DASHBOARD_LAYER_INDICATOR 526
;TYPE:CUSTOM TEMP
M104 S170
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:46728.453429
;LAYER:577
M117 INDICATOR-Layer577
M117 DASHBOARD_LAYER_INDICATOR 578
;TYPE:CUSTOM TEMP
M104 S165
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:50518.783004
;LAYER:629
M117 INDICATOR-Layer629
M117 DASHBOARD_LAYER_INDICATOR 630
;TYPE:CUSTOM TEMP
M104 S160
;TYPE:WALL-INNER
;MESH:Body1.stl
[...]
;TIME_ELAPSED:54795.788831
;LAYER:681
M117 INDICATOR-Layer681
M117 DASHBOARD_LAYER_INDICATOR 682
;TYPE:CUSTOM TEMP
M104 S155
;TYPE:WALL-INNER
;MESH:Body1.stl