Problem with Raspberry PI5 (bookworm) and Speedtest with netdata

Hi, i have a problem with speed test chart in netdata, i have installed netdata and speedtest from netdata sources, and i use last version.
my problem is: the collector works very fine for some hours (checking time every 30 minutes), also a day, in a random time the collector stop working (see image), only a reboot can reactivate the collector, i try restart service netdata but don’t work.

i have see only a error before this hangs, and is a netdata error token *8/1000 in conf file

Please can anyone help me to resolve this issue?

Thank you very much