We have found multiple examples on different boards with the same firmware where baudrates on all the serial ports changed at runtime.
For example UART0 and UART3 where setup to 115.200 bd but afte some time running switched to 142.000 bd (measured with scoop so not exact value give).
On an other board it switched form 115.200 bd to 53.911 bd.
All other clocks where still ok, OSC=26MHz, CAN worked, LCD display, ASP0 audio, PWM output...
UART0 is only setup at startup once to 115.200 bd.
UART3 is opened,closed and setup to baudrate of 115.200 bd multiple times at runtime.