yeah, that's underextrusion in the infill. What speeds were you printing at? Read my list linked to above. The "plus" feeder can print very fast. If you've printed over 500 hours on that printer (check in the menu system) then it's probably time to change the teflon part. I see them in my store at thegr5store.com but this is one of the most reasonably priced parts that Ultimaker sells so you could contact your reseller or fbrc8.com to get offical ultimaker parts.
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johnse 30
Looks like underextrusion. Try slowing down the infill speed or increasing temp a bit.
Or take a look at @gr5‘s long list here:
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