After playing a few hours, FPS drops from 40 to 5FPS

Exactly same for me Mike, except 4+ hours of flight and I was on final for WSSS 500ft from landing then CTD.

Faulting application name: FlightSimulator.exe, version: 1.24.5.0, time stamp: 0x00000000
Faulting module name: KERNELBASE.dll, version: 10.0.19041.1645, time stamp: 0x630193b4
Exception code: 0x80000003
Fault offset: 0x00000000000c90a2
Faulting process id: 0x2bf4
Faulting application start time: 0x01d855f282e0f468
Faulting application path: E:\Steam\steamapps\common\MicrosoftFlightSimulator\FlightSimulator.exe
Faulting module path: C:\Windows\System32\KERNELBASE.dll
Report Id: 3e2b089a-aaae-4f16-9871-4a5bd8bac96c
Faulting package full name: 
Faulting package-relative application ID:
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