plotly stops working and show error after some time

[comkubus7]

this week I starting see error in every plotly graph (different in every graph but similar in context):

Error: at [entities. 1 .line.colorl: Error fetching statistics of sensor.thermal_panel_new: "Unknown error"
Error: at [entities. 1 .on_legend_clickl: Error fetching statistics of sensor.thermal_panel_new: 'Unknown error'
Error: at [entities. 1 .on_legend_dblclick]: Error fetching statistics of 'Unknown error"
Error: at [entities. 1 .on_clickl: Error fetching statistics of sensor.thermal_panel_new: 'Unknown error'
Error: at [entities. 1 .unit_of_measurementl: Error fetching statistics of sensor.thermal_panel_new: "Unknown error"
Error: at [entities. 1 .hovertemplatel: Error fetching statistics of sensor.thermal_panel_new: 'Unknown error"
Error: at [entities. 1 .yaxisl: Error fetching statistics of "Unknown error"
Error: at [entities. 11: Error fetching statistics of sensor. thermal_panel_new: "Unknown error"
Error: at [entities.2.line.colorl: Error fetching statistics of sensor.boiler_temperature: "Unknown error"
Error. at [entities.2.on_legend_clickl: Error fetching statistics of sensor.boiler_temperature: 'Unknown error'
Error: at [entities.2.on_legend_dblclickl: Error fetching statistics of sensor.boiler_temperature: 'Unknown error"
Error: at [entities.2.on_clickl: Error fetching statistics of sensor.boiler_temperature: "Unknown error'
Error: at [entities.2.unit_of_measurementl: Error fetching statistics of sensor.boiler_temperature: "Unknown error"
Error: at [entities.2.hovertemplatel: Error fetching statistics of sensor.boiler_temgHature: "Unknown error"
Error: at [entities.21: Error fetching statistics of "Unknown error"

does anyone know what could be the cause?The strange thing is that after restarting homeassistant the charts work for a while. Errors appear after a while... And it doesn't seem that the time when the graph crashes is somehow limited, rather random..
here is simple code of graf:

type: custom:plotly-graph
title: Baterie
entities:
  - entity: sensor.rct_power_battery_state_of_charge
    statistic: mean
    period:
      2d: 5minute
      3M: hour
      12M: day
hours_to_show: 24
refresh_interval: 10
ha_theme: true
layout:
  xaxis:
    rangeselector:
      'y': 1
      buttons:
        - count: 30
          step: minute
        - count: 1
          step: hour
        - count: 12
          step: hour
        - count: 1
          step: day
        - count: 7
          step: day
        - count: 1
          step: month
        - count: 6
          step: month
        - step: all

[dbuezas]

It looks like home assistant is failing. May be a dying SSD or SD