Re-activation Wizard Prompt

Don't know if anyone else has had this issue but......Yesterday fired up FSX - prompted to 'repair' the installation. Went through the process and all went well, so spent about three hours flying about. No time out after 30 mins.Today, went to fire up FSX and was prompted to activate the product. Tried to do this over the internet - failed, as I'd apparently used up all my activations. However, I did manage to re-activate over the phone, by speaking to support.With regards the activations I'd used. The first was when I bought FSX - Nov 2006. The second was about three weeks ago, when I upgraded my Motherboard/CPU and replaced some faulty memory. In the past three weeks no hardware changes have been made to the pc.I would have thought if there was an issue, the Re-Activation wizard would have appeared last night, when the FSX installation was 'repaired' and not 24 hours later.Anyone else had the Re-activation wizard appear at random?