Air carrier flight crew reported a loss of engine power in flight that resulted in a diversion.

Attributes
ACN	1756963
Time
Date	202008
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 140 Flight Crew Type 15000
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 105 Flight Crew Type 4458
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

Narrative:

Had light chop leveling at FL400 requested descent to FL380. Upon leveling at FL380 with autothrottles on; I noticed #1 thrust lever in different position than #2. Engine was not responding to thrust lever movement. I then disengaged autothrottles and moved lever manually. #1 engine remained about 55% for brief time then started to rollback. We requested descent to 200 as engine was slowly rolling back. We ran the engine limit stall or surge checklist. We got a eng fail light on descent and then started running engine failure checklist. Within 30-60 seconds egt N1/ N2 began to rise. The engine recovered on its own and parameters were normal until engine shutdown at gate. We advised ATC and diverted to ZZZ. Contacted dispatch and landed uneventfully.

Original NASA ASRS Text

Title: Air carrier flight crew reported a loss of engine power in flight that resulted in a diversion.

Narrative: Had light chop leveling at FL400 requested descent to FL380. Upon leveling at FL380 with autothrottles on; I noticed #1 thrust lever in different position than #2. Engine was not responding to thrust lever movement. I then disengaged autothrottles and moved lever manually. #1 engine remained about 55% for brief time then started to rollback. We requested descent to 200 as engine was slowly rolling back. We ran the Engine Limit Stall or Surge Checklist. We got a Eng Fail light on descent and then started running Engine Failure Checklist. Within 30-60 seconds EGT N1/ N2 began to rise. The engine recovered on its own and parameters were normal until engine shutdown at gate. We advised ATC and diverted to ZZZ. Contacted Dispatch and landed uneventfully.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.