@DieterT139482
There could be any number of reasons why payments may have stopped -
but you will have to determine which, if any, of these conditions apply to your situation. This pamphlet covers many of the requirements and reasons why they may stop.
https://www.ssa.gov/pubs/EN-05-10137.pdf
It also gives other contact info at the end depending upon the situation.
cat0w gave you some good advice about signing up for a mySocialSecurity account and then review any letters or messages which are meant for you - they are suppose to always send them by mail too but being out of the country, who knows if that works well.
It's Always Something . . . . Roseanna Roseannadanna