Pouwer sub station disconected from grid after loading savegame

I place sub stations to cover more ground. I have 1 pouwergrid.All is fine until i save and start again.
Then one (always the same) substation is seperated from grid dispce propper pouwer poles. (getting error :no pouwer in grid 2)
Beacose if i remove and replace or relocate to the same place substation it reconects and all is fine until the next loading. Then the same substation is dsconected.
i play this gamme pre teraforming and i had in the same problem before.
its notting gamebraking but it seems consistend.