I haven't noticed a problem in my 2503S, but have to admit I haven't had a chance to use the TV a lot.
Have you thought of a small mirror (cosmetic type?) behind the tv that would bounce the IR signal to the radio? Basically, you're just bouncing light around. Alternatively, try aiming the remote at the cabinets above the stove/sink and see if that works. I know at home, I can bounce the signal off the ceiling. Of course, my home ceiling is white and the camper cabinets are dark, so may not bounce light as well.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10