periodically

US /ˌpɪr.iˈɑː.dɪ.kəl.i/
UK /ˌpɪr.iˈɑː.dɪ.kəl.i/
"periodically" picture
1.

at regular intervals of time

:
The machine needs to be serviced periodically.
She checks her email periodically throughout the day.