[Sinapus]

When you don't produce enough resources to pay maintenance costs, your ships will be abandoned as they run out of supplies. So either keep them near resupply depots, or build more resource producing facilities on your planets, like mineral mining facilities.

Also, check your construction costs. That tends to cost a lot of minerals. If that is high, put some planets on hold for a bit and take them off hold as your resource production increases.

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--
"What do -you- want?" "I'd like to live -just- long enough
to be there when they cut off your head and stick it on a
pike as a warning to the next ten generations that some favors
come with too high a price. I would look up into your lifeless
eyes and wave like this..." *waggle* "...can you and your
associates arrange that for me, Mr. Morden?"