That does sound like a plausible explanation!
When the unit first restarts after installing a new app, it probably has some “housekeeping” to do - and all these (apparently) invalid AT commands could be confusing it and causing it to crash (ie, restart).
Please discuss this with your Distributor and/or Wavecom FAE to get an official position on this.
It sounds like yet another hole in the whole remote update facility! 