Hello Russian Furry.
I picked up a American TPH about two months ago to replace the Keel-tec P-32 that I had been carrying. The P-32 had become totally unreliable and I didn't trust it any more. (a whole other story). I got a TPH due to size, looks and inexpensive ammo. I have shot about 2,000 rounds through it. I absolutely love this gun. It is "Brand Sensitive". Mine likes any Remington but hates Federal & Winchester. I have not had any problems at all in over 1,700 rounds or so with Remington. I carry MPB QUIK-SHOK, a .22 defensive cartridge. I've only shot 100 rounds of that but it likes them!
When I got mine it didn't function in double action. I sent it off to Walther USA and they fixed it free including shipping both ways. I talked to the gunsmith that worked on mine and he said that I have a "good one". He said some are hard to fix and some can't be fixed at all. (Mine only had a defective hammer). I told him like I'm telling you... I love this gun. I told him that I was going to get another one, he said "don't". I got a good one and it sounds like you do too but the Walther gunsmith said in general that they are problems. I love mine and I'm keeping it, but I'm not getting another.
Also I only carry it when I'm "unarmed", jogging, and such, the rest of the time I carry my American made SS PPK in .380 love this one too. Hope I helped you.