Warning "Insufficient Funds" although wallet has BAT for at least 8 month

[wth]

Description of the issue:
From time to time I get a warning “Insufficient Funds” although the BAT wallet is filled with 251.5 BAT which is enough for the next 8 months payments. I would just ignore this warning but I suspect that this error is the reason why since 2 month in a row no monthly payments have been executed.
See below some screenshots illustrating the situation:
Steps to Reproduce (add as many as necessary): 1. 2. 3.

… the recent warning
… current wallet status
… monthly payment schedule
Sorry, new users can only put 4 images in a post. … Tips scheduled (10 BAT)
… until 2/20/2019 payments were executed
Actual Result (gifs and screenshots are welcome!):
not applicable
Expected result:
not applicable
Reproduces how often:
two times … will surely happen again next monday (5/20/2019)
Operating System and Brave Version(See the About Brave page in the main menu):
Sorry, new users can only put 4 images in a post. … Windows 10 - 64 bit
Sorry, new users can only put 4 images in a post. … Brave is up to date (Version 0.64.76 Chromium 74.0.3729.157 (official build) (64-bit))
Additional Information:

[jperales]

Buenas tardes, a mi también se me esta presentando el mismo error desde el mes de marzo hasta la presente fecha. esperemos que soporte nos ayude a solucionar este error y asi poder seguir recibiendo las recompensas gratuitas que solo brave nos otorga como usuarios.

[wth]

Today the monthly payment was executed correctly. So from my point of view the issue is solved.

Best regards
Wolfgang Thomas