I had a problem the other day with my Tacx Fortius and I actually forgot that I had had the same issue just after I had bought it. The trainer would work fine when cycling and then suddenly the rear would start braking in a erratic way. Almost braking and then releasing with small jerks.
After some googling I found that it was quite a common fault with the Fortius units and all it was was just the connector plug that had some loose wires. Below are some photos of how to fasten these again.
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- Step 1 – Disconnect the brake unit from the trainer
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- Step 2 – Take the end connector
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- Step 3 – Start unscrewing the end fastening screw
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- Step 4 – Once undone, it should look like this
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- Step 5 – Unscrew the main housing unit
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- Step 6 – Once these have been undone it should look like this
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- Step 7 Fasten all the screws making sure that the wires are still intact
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