Maybe its the latest IOS thats causing the problem? Game may not be optimised to run for it. I dont think you can roll them back though can you? (apart from factory settings restore...eugh)
Also, had never heard of it, so looked it up on wikipedia..
Tichu is the trade name for what appears to be a variant of Choi Dai Di (Hong Kong slang: "Step on the little guy") or Da Lao Er (Mandarin slang: "Big penis")