Your node can be offline up to 12 days until be suspended for downtime. The suspension means that your node will not have any ingress until the online score become greater than 60%. To fully recover it need to be online for the next 30 days. Each downtime requires another 30 days to recover.
So, the low online score is not necessary will lead to disqualification (only if your node was offline for more than 30 days), it can recover if you fix the offline issue. However it’s not for free - while your node offline, pieces on it considered as unhealthy after 4 hours offline, and if there is a repair job got triggered, your pieces could be recovered to other nodes and as soon as you bring your node online, and the garbage collector got triggered, it will move all such pieces to the trash.
In other words, the more your node is offline, the more data will be moved to the trash.