Have any of you ever had issues with signal interference when controlling your trains? Today I had 60051 and 60052 set up in a classroom environment. I had checked everything at home and all worked fine. (Worked fine at home afterwards also.) Batteries were fully charged (Lego rechargeable) and new batteries in the controller. But during the session signals to the trains were either not getting through or were very significantly delayed.
Other (possibly) relevant information: There were a lot of laptops in the room (not close to the trains) but all were off or at least closed and therefore in sleep mode. There are about 6 double fluorescent tube lights on the ceiling and there was wifi in the room.
Any suggestions as to probable causes and potential solutions greatly appreciated.