Sounds like a lot in just a short period of time. Usually Horizon is pretty good with there customer support on the products for warranties. Over all I’m not a big fan of arrma’s products but that’s just my opinion and what my use is for.
Well it’s a hit and miss of how they hold up. I’ve seen a few arrma’s where I run and seems like they can take a pretty good beating. I’m sure there’s areas too up grade part of the hobby. and by the sounds of it all the work you have done just makes it more bulletproof.