1/ cracked tiles on shower wall and around tub: some are deep, some look like glazed (crazed) cracks. There are now 75 cracked tiles which are progressing over 4.5 years, starting from month 1.
2/ Rain leaks through the wall (in 2 different places, on same said of wall), happened after 4 years.
3/ French door locking mechanism broke (after 4 years).
4/ Front wooden door out of frame (was adjusted during the first year, and it's now out of frame again recently, enough for rain to poor in).
I would like to find out if these are normal wear and tear. if not, is (are) there common causes or just separate mishaps?
Thank you for all opinions.