CCS/EK-TM4C1294XL: UARTSend does not send large strings back - they are being cut for some reason

Tool/software: Code Composer Studio

i have a strange issue with "UARTSend" function from "uart_echo.c" example. for some reason, the response i'm getting when sending the command "info" through uart is cut.
i am supposed to get back:
{\"version\": \"1.0\", \"id\": \"37826342234\" }

but instead i'm getting only this back:
{"version": "1.0"

when i do this char by char with a breakpoint inside the loop at "UARTSend" it returns the entire string fine. maybe a delay is needed here?

these following are my UARTSend and UARTIntHandler:

void UARTSend(const uint8_t *pui8Buffer, uint32_t ui32Count)
{
    //
    // Loop while there are more characters to send.
    //
    while(ui32Count--)
    {
        //
        // Write the next character to the UART.
        //
        ROM_UARTCharPutNonBlocking(UART0_BASE, *pui8Buffer++);
    }
}

i am using the following UART interrupt handling function:

void UARTIntHandler(void)
{
    uint32_t ui32Status;

    //
    // Get the interrrupt status.
    //
    ui32Status = ROM_UARTIntStatus(UART0_BASE, true);

    //
    // Clear the asserted interrupts.
    //
    ROM_UARTIntClear(UART0_BASE, ui32Status);

    //
    // Loop while there are characters in the receive FIFO.
    //
    char b[5];
    int i = 0;

    while(ROM_UARTCharsAvail(UART0_BASE))
    {
        //
        // Read the next character from the UART and write it back to the UART.
        //
        b[i] = ROM_UARTCharGetNonBlocking(UART0_BASE);
        i++;
    }


    if (strstr(b, "info"))
    {
        char* response = "{\"version\": \"1.0\", \"id\": \"37826342234\" }";
        UARTSend(response, strlen(response));
    }
}