The SR2000 is known to be power hungry and give connection issues if the electronics have too much demand on the battery pack as its charge goes down.

Might of been lower charge on the battery tonight vs when you were practicing? Usually connection issues occure after 20 to 30min the RC being on while fine at first with full batteries. See if it occurs only with lower voltage on the batteries vs a freshly charged battery

Do you have a different RX so next time it occurs swap and see if its the RX and nothing else.