Why does pokemon tcg live keep giving me the worst decks to use for more than 40 games.

Hi. I have been in Pokemon TCG Live for almost 2 years now. A few months ago, Pokemon TCG Live released a new update. Ever since, I have played many many games. At the start, it was fine. Soon, after I stopped playing for one to two days, I started losing and getting all the worst cards in my deck to play with. The cards were the only problem. Caoin flips and all others were fine. Accept, in the shop, when I redeem codes, the system gives me more common cards than in the past and it sometimes auto concedes. Can somebody look into this problem? Thank You.