your description is very vague
start off with telling what rf24 library you are using, there seem to be many different forks
(I use tmrh20s fork as it seems to be stable and actively worked on)
if the arduino has a problem with the radio, i would suggest checking the hardware/connections first, and try to get that working using one of the supplied examples in the library
also keep in mind that the nRF is a 3.3v device (but can be connected to a 5v arduino)
and finally - the nRF has problems with noise on the power supply line - it is solved by soldering a condensator between vcc/gnd directly on the module. I had good results with a 10UF elco, others used all sorts of caps, with good results.
there is a lot of information that you can find about the arduino/nRF combination - google is your friend
my personal experience is that the nRF is a bit flaky to get working reliably. I am still struggling myself, to be honest