PHPFina.php: "WARN Posting too fast?"

Please,

Any idea how to solve this? I have a "Power to kWh" feed with the following error message. I already tried to do this feed update every 60s, without sucess.

2016-01-22 13:08:22.915|WARN|PHPFina.php|post_bulk_prepare() data in past or before next interval, nothing saved. Posting too fast? slot=10 feedid=93 timestamp=1453468070 pos=1670588 last_pos=1670588 value=31

How could I solve this? I have many messages per second.
Thanx.