[off-topic] MTNL ADSL Modem : any industrial strength replacements?

Hi,

I am using MTNL Triband ADSL, and the modem they've supplied is too soft 
for 24x7 operation at my home.

I've just got the Amazon Echo Plus and running Alexa demands Internet 
connectivity at all times.

Are there any industrial strength replacements available for the MTNL 
supplied modem?
If yes, may I get details and approximate market pricing?

Thanks,

~Mayuresh

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