Whilst in my opinon one of the best Masdevallias it is also one of the least tolerant of heat as it originates at very high elevations, they usually flower late winter & early spring, I would certainly suggest high temperatures are definitely why your plant is not flowering very similar to M. Veitchiana, not being familiar with your growing conditions I would suggest you find the coolest part of your grow space and move the plant out of the heat I would also repot into a new fresh media ASAP and you could contact the seller and ask what conditions your plant was grown in. You may get additional help from members of the facebook group ! Try them as well.