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What causes airplane to bounce up and down at high alt?

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What causes an airplane to bounce up and down at high altitudes with the autopilot? My F1 Mustang is unable to keep an altitude or climb now. The past 2 days it was perfect, now suddenly I cannot fly it anymore. This is using both AS2012 and Opus weather. Is it turbulence or wind or something else? Or is it just a problem with the airplane? How do I fix this? Thanks

Could very well be turbulence/wind speed at altitude.

My computer: ABS Gladiator Gaming PC featuring an Intel 10700F CPU, EVGA CLC-240 AIO cooler (dead fans replaced with Noctua fans), Asus Tuf Gaming B460M Plus motherboard, 16GB DDR4-3000 RAM, 1 TB NVMe SSD, EVGA RTX3070 FTW3 video card, dead EVGA 750 watt power supply replaced with Antec 900 watt PSU.

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