Irregular heartbeats, when is this a problem

My husband and I are on day 28 on the MC.

He has been having episodes of irregular heartbeats.

He does not feel dizzy or lightheaded, it is just an extra beat every 5 to 10 minutes.

It does not happen all of the time, maybe about 1 hour.

Has anyone experienced this?

We are both drink about 6 glasses per day, but on the past few days he has had way less, because he is getting sick of the juice.

Could this be a factor?

Any insight would be helpful.

THanks.