Sorry, it's always tuff to guess at what's going on. I just throw out some suggestions. It's even tougher here for you, as you are traveling and not doing it at home. All I can guess at, is to always take extra stuff so you can troubleshoot better. You may not wish to expose your equipment to other's layout though?
I read a post here where it was suggested to swap out the cords as a first step. So I reposted that.
I personally experienced issues when the signal wasn't good, so I shared that too.
Beyond that, stay open to ideas of troubleshooting everything. I've learned in R&R, if it can fail, it will fail!
In toy trains integrated with modern tech, this tech can always be challenging at times. Certain devices like IOS ones for me, can throw a curve at me. I run all android so I don't have the best ideas here. I have read here, where certain IOS devices operate differently. Nothing wrong, just differently!
