Unfortunately, if you own the Samsung Galaxy S7, it seems that the device has become too old for Samsung to invest resources into keeping it updated on a monthly basis. According to Samsung’s security page, both the Galaxy S7 and S7 Edge have been moved from receiving monthly updates to now receiving quarterly updates.
The handst hasn’t been completely abandoned yet as it will still receive updates every 3 months, but presumably the goal here is to try and get users to move over to the newer phones. The Galaxy S7 and S7 Edge were released back in 2016 so they are about 3 years now, which based on Android standards makes it pretty ancient.
Interestingly enough, the Galaxy S7 Active is still part of the list of handsets that will receive monthly updates, but we expect that over time it should be moved to quarterly updates as well. If you own the Galaxy S7 or S7 Edge, then we guess now that the security updates are less frequent, you should probably be more careful with your device.