The 2 most common causes of fruit drop are uneven watering or temperature fluctuations.

Do you check the soil before you water? It may be that with all this heat, the container might need an additional watering as containers do dry out quickly.

Or it could be that going from 80's into triple digits is too much temp. fluctuation.

Citrus are heavy feeders, so it may be time to fertilize again, which could be a third reason for fruit drop...not enough nutrients to sustain fruiting. Check your fertilizer and see if it gives instructions for containers.

wanda

It is uncommon for a tree to act this way after transplanting