If you think it is very unstable, please send it back to
Bitmain Warranty
3700 Quebec Street
Unit 100-239
Denver, Colorado 80207
USA
Tel: 844-248-6246 Option2 (USA Country Code is 1)
Please use a tracking number and include a printed paper with your shipping information and a telephone number and where you purchased it from
Thanks and sorry for the trouble....
@Visvas,
what version of U3 are you using? the new cage looking version or the rice cooker version?

the rice cooker version. Rough metal with holes.