Kyocera Slider Remix KX5 / Slider Sonic

I talked with a US Cellular tech today and he educated me that the KX 5 has a problem reading any memory card over 512mb and that this is a possible cause to the phones resetting when you try to access your music. Dont know if this helps anyone, but thats what I have to pass along. He asked me to suggest to my customer to go with the 512 and make sure its not overloaded