every so often

But every so often, that might just be the case.

Most of the time the virus drifts along making minor changes and then every so often there is a sudden abrupt shift as the virus mutates substantially.

My dad probably told me a lot on the phone from prison, but I could only talk to him every so often.

Streaming may have emptied theaters, but every so often a film breaks out, and crowds gather for the shared experience of something alive.

Some students have told Jarquin that they like to keep their cellphones on their desks so they can text their parents every so often and make sure they’re safe.