Your mining balance can drop to 0 in the following cases:
We are issuing payments and you qualify for a payment. Read more about the payment schedule. This process takes from several minutes up to several hours and during that time, a notification is displayed on the website.
You have changed the Bitcoin address, used for mining. We use Bitcoin addresses as an identification (link to you). Also be aware that we cannot transfer from one mining Bitcoin address to another. If you wish to change your address, we suggest you to mine until you reach the minimal balance for payout and then change your address.
If you are using an older unsupported version of NiceHash Miner. Make sure to always update your miner to the latest version which you can find here.