Vehicles Despawn way too often

I lost a fully modified motorcycle a few days ago and now I just lost a gyrocopter... This is ridiculous. I landed in wasteland to farm a ode real quick, landed on a road and ran 15 feet away to the node, got done fsrming and turned around to go get back in the gyro and it is despawned. Gone... No marker on map. No gyro anywhere. Getting sick of having to make these vehicles over and over.