You say you don't use mods in TM, KK and BB, so those modes should be fine. Have you used 1 wave to clear other non-ranked events that give points based on the drops you got in that stage? It's not plausible that it's ads fault otherwise everyone should get this message. As for exceeding items, I'm sure last time I checked I had over 10.000 items (20 pages of items in my box, each one with 500 items in it) with a limit of 600-700 iirc and never got flagged as cheater.just got my first warning ever, so be careful guys. Besides box space I never used any mods in live events like TM, kizuna or blitz battle and I also used the mod of iAlex for years now. Don't know if its something related to the new advertisments or if its just coincidence that it happens after their insertion
Have you cleared, by any chance, an high level assist request in Kizuna? Some people exaggerate with cheating and clear a lot of levels, even going over the boss HP limit (which is 2.000.000.000 and impossible to defeat with a clean game). It's just an idea, I cleared very high levels maybe 2 or 3 times since Kizuna released on global version but never been detected because of this.