Looks like the missed vote is because nodes stopped responding again. We've restarted our bot to connect to a different node and it should catch up soon.

Your vote value fluctuates depending on several different factors. Your account earns rshares (pending vote value) every 2.4 hours and then receives up to 1/3 of your pending value when you post. The actual vote values can vary depending on how the blockchain is valuing those rshares (HIVE price), along with how long it has been since your last post. Shorter intervals mean less rshares accumulation.

You should only expect consistent vote values day to day several conditions are met:

• if your posting frequency is always the same (you would have to post at the exact same time every day),
• HIVE price is static
• reward pool usage is consistent
• our sustainability metrics are unchanged

Since all of these things change often, you should expect your vote value to vary from day to day. At a minimum, since posts don't even payout for a week, you should evaluate vote values after two weeks at any given SBI level (a full week of payouts) before establishing a baseline expectation.