Why does my Huawei-B593-4462 router flash a purple light?

[jp@pprok.co.za]

I have two Huawei Routers - one at the office and one at home. The one at home every now and again loses internet connection and flashes a purple light. Why?

 

[Rickster]

Status: Blue. This indicator is constantly blue when the Huawei B593 has accessed the LTE network but no data is transferred. This indicator is blinking blue when the CPE has accessed the LTE network and data is transferred.
Status: Green. This indicator is constantly green when the B593 has accessed the UMTS network but no data is transferred. This indicator is blinking green when the CPE has accessed the UMTS network and data is transferred.
Status: Orange. This indicator is constantly orange when the B593 CPE has accessed the GSM network but no data is transferred. This indicator is blinking orange when the CPE has accessed the GSM network and data is transferred.
Status: White. Huawei B593 is accessing the wireless network.
Status: Red. This indicator is constantly red when the B593 fails to access the wireless network or the CPE does not access the wireless network.
Status: Mulbery. This indicator is on when the SIM cannot be identified or the PIN is not entered or the PIN check fails.