Transformer Hot Ring Pro 2

Hello Originally installed a 16V 30VA with 50W resistor and kept getting Poor Power output in the ring app for the video doorbell. Swapped the transformer out with a 24V 40VA, power output in the app is Good but boy that transformer seems to be running hot to me... measured the temp at 121F. What normal? Should I be concerned about a fire hazard in my attic? Running 18/2 wire no mechanical chime in the set up. Thanks