Low Level Flight: Colorado River, Las Vegas to Page (USA) in Microsoft Flight Simulator 2020

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I’ve been flying in Colorado Canyon in many simulators since many years ago, but I felt this is so big that I never get the complete map in my head, so I purposed myself to follow the Colorado River across the Grand Canyon. This was in fact 3 flights, edited as a continuous flight:
1. From Lake Mead to Matkamiba Canyon: no other problem (well, some glitches on the river) than a fuel miscalculation, my fault. I ran out on fuel before arriving to the aerodrome where I planned to refuel. You can see that moment at the end of the video.
2. From Las Vegas-McCarran International Airport (KLAS) to Lake Mead: made this part of the flight after studying the map; Las Vegas was a nice starting point for this video and also it was close the Hoover Dam and the Mike O’Callaghan–Pat Tillman Memorial Bridge. If you try to fly under the bridge, do it very low like me. There’s an unrealistic collision box from 10m to the upper side, discovered this hole in the collision box by luck on my first attempt, only to crash after the loop. After studying where to pass, could make this part without problem.
3. From Matkamiba Canyon to Page: third part to complete the flight, making the landing and refuelling I had planned at first, in Grand Canyon National Park Airport (KGCN). There I has an issue with the simulator; the zoom stopped working and I could not click anything inside the cockpit anymore. Also, after refuelling, the ATC menu failed and I had to take off without permission. On arrival at Page, flew under the Glen Canyon Dam Bridge with a square looping, and over the Glen Canyon Dam, the avionics started to fail and the ATC menu said the radio was off, but I landed in Page Municipal Airport (KPGA) after visually checking the windsock, again without permission.
Microsoft/Xbox provided a copy of ‘Microsoft Flight Simulator’ to me for review.
This is the version 1.8.3.0.
My website: www.airvideoworld.com
Pc specs: I9 9900K 64 GB RAM RTX 2080. Settings High at 4K, recorded and uploaded this video at 4K.
Main Control: Yoko “The Yoke” Plus: https://www.virtual-fly.com/en/shop/controls/flight-sim-yoke-yoko-the-yoke-plus
Throttle: V3rnio TPM Plus: https://www.virtual-fly.com/en/shop/controls/v3rnio
Rudder: Ruddo Plus: https://www.virtual-fly.com/en/shop/controls/ruddo-step-on-for-real