Recently , one week, my roon wont wake up through the roon remote

I have nuc as a core and using android as remote
Every thinh is up date
The roon theough the nook is working i can operate it through the nuc. But it taking ages to the remote to recognize the core.
I some time install and uninstall the remote and afterwards it recognize the core fast but not every time

Need help here
Ilan v.