Wifi - frequent disconnect - ubuntu mate

wifi gets disconnected after few mins. below is some info… kindly suggest a solution.

[email protected]:~$ lspci | grep -i wireless
09:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
[email protected]:~$ lspci -vv -s 09:00.0
09:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
Subsystem: Hewlett-Packard Company Device 2231
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 16
Region 0: I/O ports at 3000 [size=256]
Region 2: Memory at c3100000 (64-bit, non-prefetchable) [size=16K]
Capabilities:
Kernel driver in use: rtl87

Try changing your software sources download location to “Main server” if it isn’t already and run updates!, if it is already set to Main server, change it to best location!:

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