Thanks for replay.
I’m not sure still if sometimes 10 min fly so slow or could be some bug over there.
I was doing 2 times waves over 100 to 220 and stock didn’t reset. I’ll take closer look on this today. I going to push to level 100 with my char so i ll have more date on it. This time no full hd resolution and medium settings but 800x600 res and min setts 
Btw i had couple times new wave UI showed up but Arena spown new mobs and UI was in the middle of the screen. If it happened again i’ll take screenshot.
Edit:
The contents of the shop will reset after not being opened for ten minutes.
Does it mean if i sell in shop before every wave it ll add 10 min marker again? If so it isn’t to good for me.
I pick up items because is faster and easier to check mods in inventory then on the ground therefore sell them then drop them again. Item names and mods on the ground are to small. I know it ll be loot filter and it ll fix this issue but atm no other way works for me.