wordpress - 503 Over Quota Every morning -

every morning between 8 , 9 cet site shows error:

error on quota application temporarily on serving quota. please try again later. 

although billing enabled , site has been running many months now. on old billing status page, there's setting maximum daily budget (set handle peak traffic , buffer against sudden traffic surges.) set $0.00, if change e.g. $10.00, still shows 503 error, seems has nothing it.

the new billing page looks this:

it happens every morning between 7 , 8 cet, around midnight pst @ least indicate still might have billing?

here's how external monitoring system shows outages, i.e. multiple outages every morning , no problems rest of day.

the google developers console overview page errors status code shows 503 error in green.

if @ monitoring logs of 503 errors between 7 , 9am following pages:

• /
• /wp-cron.php

and there 500 errors, e.g. @ 8

08:07:08.092 ... [26/nov/2014:23:07:08 -0800] "get / http/1.1" 500 0 - "pingdom.com_bot_version_1.4_(http://www.pingdom.com/)" "www.coworking-radolfzell.de" ms=921 cpu_ms=1042 loading_request=1 exit_code=108 instance=00c61b117c9ad93b9da1f63314065ff8f4188095 app_engine_release=1.9.16  08:07:08.092 request caused new process started application, , caused application code loaded first time. request may take longer , use more cpu typical request application.  08:07:08.092 process terminated due exceeding quotas. 

the (new) quota details page says quotas reset every 24 hours. next reset: 1 hours , it's 8:30 cet. of listed resources rated okay.

if go old quota detailsp page, though, see requests' frontend instance hourshave reached 100% , rated limited.

so went new console under compute / app engine / settings showed your budget today $10.00. effective tomorrow, using free quota. increased daily budget of usd 5.

my site still shows 503 error, solution. should able tell in 24 hours, shouldn't i?

if google app engine reading this, there might inconsistencies between old , new panels should fixed.

my problem has been solved increasing daily budget vom 0 5, although took couple of hours take effect. haven't had notifications monitoring system, seems fine now.