Dell — software problem

Address:

Ghaziabad, Uttar Pradesh

I took a dell venue 7 3740 LTE tablet and after 2 months o[censored]se it started having problems with its Sim detection..my sim is detected by tab for only 4 minutes after that its doesn't shows signal and says no service...I researched for it and found that it is having problem with its imei number.imei number is detected when my sim card is detected I call on *#06# and its clearly shows imei number..but after 4 or 5 minutes my Sim card stops and then I dial *#06# and no imei shows...clearly a software defect..help me solve this