one time switch off engine and switch on again, mean electrical problem not a mechanical or transmission oil problem, check the transmission relay.
Can you guide me where the transmission relay is located
open fuse box under the hood and under the dash check the fuse box cover diagram.
ATF is checked on a hot engine with lever in Park and engine running, if you check it with engine stopped the level will be high as half the torque converter drains back into the pan.
Im pretty sure toyota is not chrysler or nissan which use a fuse and relay for the trans. In a toyota all wiring comes straight from the ECU.