After seeing comments from @logen9f , @solymi, @mcoinz79 , @freecompliments - I've made a small research on Top10 leo.voter HP delegators:

@sepracore ( 190K HP) missed payouts 4, 5, 7, 8, 9, 10 days ago
@taskmaster4450 (123K HP) payouts 4, 5, 7, 10 days ago
@mcoinz ( 116K HP) - 4, 7, 10 d ago
@pouchon ( 101K HP) - 4, 5, 7, 10 d ago
@lafona-miner ( 76K HP) - 4, 5, 10 d ago
@notak ( 65K HP) - 4, 5, 7, 10 d ago
@inertia ( 61K HP) - 4, 7, 10 d ago
@monkmasters ( 53K HP) - 4, 7, 10 d ago
@mangowambo ( 52K HP) has missed payouts 4, 5, 7, 10 d ago

Top 10 delegators hold 49.75% of total leo.voters HP. Almost half.
And the last column in my table shows that the problem does not comes from a "frequent HP dlegation updates/removals" ( as has been falsely stated for a possible reason)

Please note LEO and USD numbers are aproximate, from past bounties, $LEO price in table taken as $0.0234

#feedback