The Finnex PX-360 has a self priming mechanism built underneath the canister hood. If the seals are not properly secure, you will get the situation you are describing often and may see some leaking from the canister at some point. Air is being built up within and the priming mechanism is releasing that trapped air once it gets to a certain point to avoid stopping the canister water flow.
The daily occurrence is normal. If seals are tight, many factors can still play a role. Whether it be the canister sucking and storing air, biological gasses within the canister, CO2, etc.
Hope this info helps! Please note, if this is happening over and over again in short periods of time, please check for leaks as one of your seals may not be tight.