When I upload the sketch with SendSharpOn() and SendSharpVolUp(), I can open the web page and function are working.
However, when I upload all 3 function together, then I cannot open the web page.
Error message says that server did not response. Other web browser says that time out.I try to fix the problems by using different IP address, it doesn't.
If one or two functions are OK, but three is not, then the problem is that you have run out of memory. You will need to move some of those massive arrays into PROGMEM.
I'd give serious consideration to learning how to get rid of the String class, to. It is very inefficient in how it handles memory allocation. People were writing text processing applications for 40 years before the String class came along. You can, too.